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A table that provides access rights to each object in a system. For example, in a wiki, certain users may have the right to add and edit content, while other users may only be allowed to read the content. The purpose is to enhance the security of a network or information technology (IT) environment.
Shorthand for "Asynchronous JavaScript and XML," is a web development technique for creating interactive web applications. The key advantage to AJAX-based applications is an increase the web page's interactivity, speed, and usability.
Atom Feed: 
An XML file that encodes web content – usually from blogs. A user can subscribe to an Atom feed and read updated content from a newsreader, web site or handheld device. The process is known as syndication and companies are increasingly using this approach to communicate with employees, partners and customers.Architecture of participation:
A scenario where a community of users build a system (Tim O'Reilly coined the term in 2003) and is a critical part of Web 2.0. Common examples include MySpace, YouTube and Flickr.
Some businesses are using the power of architecture of participation. An example is Salesforce.com. It has a system called AppExchange that allows its users to build new applications – such as for HR, payroll and so on -- using the Salesforce.com platform. This not only enhances the value of the company’s offering but also helps to encourage more customer loyalty.
Blog / Weblog:
User generated website where people can publish comments on a webpage via an browser. Content entries are sorted by date (with the most recent at the top of the page). The content may be organized based on categories and tags (which are often listed on the right-side of the page). According to Technorati.com, there are more than 55 million blogs.
There are two main types of corporate blogs: internal and external.
Internal blogs are available only to employees of a company (or selected partners, suppliers and customers). For example, the chief of product development may have a blog that has the latest metrics on projects, meeting schedules and feedback. An RSS feed can also alert people to content updates. Moreover, by tagging posts, it is easier to find information.
Internal blogs have advantages over email because information is accessible by the group instead of locked in individual users email files. Internal blogs are quite popular at some companies. For example, IBM has more than 3,000 internal blogs.
External blogs are available on the public Internet. Key employees can write about industry trends, product updates, the goings-on at the company, upcoming events and so on. It can be a way to create a dialog with customers, as well as build brand and increase search engine optimization (SEO). In some cases, a company can use a public blog to deal with a crisis.
Blog Aggregator:
A web site that keeps track of blog posts. There is usually a search box and RSS updates. Submitting a blog to an aggregator can increase exposure and get your content in front of a wider audience.
Blogosphere:
A common term used to describe the large and diverse community of people who contribute to blogs. Some bloggers are very influential and reach a large audience, allowing news to travel quickly among this community. This is the factor causing many companies to monitor and reach out to the blogosphere to protect and promote their brand identity.
Bookmark:
A browser function that allows users to store links to specific web pages at their fingertips. This makes it easier to return to favorite web pages. Web sites, such as delicious, allow users to organize their bookmarks, share them with others, and access them from other computers.
Bookmarklet:
A direct link, not only to a specific webpage, but to specific function within a page. Similar to a Bookmark, Bookmarklets are stored on the user's browser. For example, a bookmarklet may search a term in Wikipedia or pull-up a Google map, or in Near-Time bookmarklets trigger a new "News" item to be posted to a space. A bookmarklet usually has a small amount of programming code and is free. Thus, it is mostly a feature (or even a time saver), not an application.
Categories:
One of two primary methods for organizing content stored in Web 2.0 applications and environments, the other is "Tags". Categories are generally serve to organize content at a higher level than Tags and are used to group pages, blog posts, files, events, or other data into groups. This organizational tool makes discovery of content and navigation easier.
Comments:
Web 2.0 technologies are enabling a more participatory environment on the Internet. The most commonly used method for generating information within a group or community is through comments. In most cases commenting allows an audience to provide feedback for a blog or wiki posting. Depending on the specific site, comments can be anonymous or tied to a user’s identity.
Content:
Information and experiences created by individuals, institutions and technology to benefit audiences in contexts that they value.
Creative Commons: 
A nonprofit organization that promotes free public licenses to content (http://creativecommons.org/). Creative Commons provides specific conditions through which content can be reused, such as attributions, links or other notification methods to correctly identify the original source.
For companies that want to maintain ownership of content – but also want to spread the content – Creative Commons Licensing is an effective approach.
Enterprise 2.0:
The application of Web2.0 concepts in a corporate environment. As tools such as blogs and wikis are entering the mainstream, companies such as IBM, Intel, Ford and others are rolling out internal and external Web 2.0 features on their websites. Andrew McAfee, an associate professor at the Harvard Business School, coined the term and has been a major contributor to their success. (http://blog.hbs.edu/faculty/amcafee/)
Feed: 
The most common type of web content syndication. Feeds are generally done via RSS or ATOM (see definitions). By subscribing to a feed, a user can consume content from blogs, wikis, websites, or other frequently updated content through their "feed reader" without having to constantly visit the content source online. Depending on the type of reader a user chooses, RSS and ATOM feeds can be consumed in a browser, via email, or on a mobile device.
Folksonomy:
Collective output of the social or organic use of Tags. This allows users to organize information on a web site, which is accomplished by using tags. This is in comparison to the traditional approach, where there are editors that categorize information. Examples of using folksonomies include Flickr and Del.icio.us.
Instant messaging (IM):
Instant Messaging or "chatting" is a popular method of exchanging text messages in real-time. Popular IM applications include AOL’s Instant Messenger (AIM), Microsoft’s Messenger, Google Talk and Yahoo’s Messenger. IM is increasingly being used as an alternative to email & is rapidly growing as a preferred means of communication in the workplace.
Links:
Links or better known as Hyperlinks are the core navigation & publishing method of the Internet. A user can access any type of object (e.g. text, images, video,….) by simply clicking on a link within a web page.
Mashup:
The term mashup refers to a new breed of Web application where content, data, or other services are combined from more than one source into an integrated experience. An example is ChicagoCrime.org (http://www.chicagocrime.org/map/), which combines Google Maps with crime data from the Chicago Police Department into a freely browsable database of crimes by location.
Mashups are also invading the corporate world (often referred to as “enterprise mashups”). For example, a company can use a database of sales information and combine it with weather data for predictive purposes. IBM has introduced a proto-type mash-up toolkit called QEDWiki.
Network Effect:
The internet has now has over 1 Billion users on a global basis and continues to grow at incredible growth rates. This growing user base enables companies that embrace the Web to leverage the unique opportunity of the Internet's "Network Effect". This is the premise that any network becomes more valuable to both ownership and membership as as more people join it.
Dion Hinchchliffe, a noted Web2.0 analyst has frequently blogged on the value & opportunity of the Network Effect for corporate enterprises.
Peer to peer (P2P):
Just as the Network Effect is creating unparalleled access to a global customer base, the Internet's availability of computing power & resources is also creating the new business models. Peer to Peer (P2P) applications rely primarily on the computing power and bandwidth of the participants in the network vs. having to provision large centralized data centers. This P2P architecture enables new services to be launched with much less capital expenditure and operational resources.
Skypeand Napsterare examples of these kind of peer-to-peer companies that are changing the competitive landscape. Traditional content producers & distributors such as record companies, have shown their concern about what they consider illegal sharing of copyrighted content by suing some P2P users.
Podcast: 
Podcasts are a great way to deliver digital media files via the Internet for marketing, training or other commercial purposes. These files are distributed over the Internet using syndication feeds for playback on PCs and portable media players. The term “pod” comes from Apple’s popular music device, the iPod.
The availability of Podcasts are exploding on the Internet and can be found on emerging directories or many Web sites such as iTunes.
Read-Write Web:
The primary difference between the initial static Internet implementations and Web2.0 is the ability for users to generate content via simple "Read-Write" website applications such as Wikis & Blogs. This new functionality enables business executives across the enterprise to engage customers, partners and suppliers in an interactive dialog. The Read/Write Web site is a great resource & one of the more popular weblog.
RSS (Really Simple Syndication): 
A form of syndication that lets users "subscribe" to receive new or updated content from blogs, news, or other frequently updated online content sources. RSS is a simple format which can be easily implemented by website administrators and easily consumed by it's consumers. RSS feeds are typically received by a "newsreader" inside a user's browser or email program - some applications can also send RSS feeds to mobile devices.
Increasingly, corporations are using RSS as a way to communicate with customers and prospects by making RSS an option for newsletters, product updates and other messages. Inside the enterprise, RSS is becoming a common way to help employees overcome "information overload" - a few companies are addressing this issue very effectively, among them are NewsGator and KnowNow.
Here is a link to a interesting video explanation of RSS by Common Craft.
Software-as-a-Service (SaaS):
Software that users purchase based on a subscription model (such as every quarter or every year). In most cases, SaaS involves software that is delivered via the Internet (also known as hosted software).
Leading analysts such as Gartner are predicting that within a few years over 25% of business applications will be delivered as a SaaS model vs. traditional licensing.
Search Engine Optimization (SEO):
SEO is an important component of an overall Web marketing strategy. It is the process of improving the quantity and quality of traffic to a website from search engines. Typically, the earlier a site is presented in the search results, or the higher it "ranks," the more users will select the corresponding links.
The term SEO can also refer to "search engine optimizers," a term adopted by an industry of consultants who provide optimization services on behalf of clients who perform SEO services in-house. There are many freely available articles and whitepapers on how to implement SEO such as by INC. Magazine.
Social Bookmarking:
Social bookmarking systems enable users to store lists of Internet resources that they find useful. These lists are either accessible to the public or a specific network, and other people with similar interests can view the links by category and tags. This sharing of this tagged content can create a grassroots popularity rating of a site by users.
There are several websites such as digg or del.icio.us that operate consumer oriented social bookmarking services.
Social Networking:
This is using the web to communicate with friends, colleagues and even strangers. Social-networking sites have been in existence since the early days of the Internet. Many of the sites involve personal activities, such as dating. However, some corporations – like LinkedIn– have leveraged social-networks for business purposes.
Mashable is one of the leading Social Networking news weblogs.
Tags:
One of two primary methods for organizing content stored in Web 2.0 applications and environments, the other is "Categories". Tags are an informal approach of using keywords to classify content for later retrieval. They are usually chosen personally by the author/creator or the consumer of the item vs. being part of a formally defined classification scheme
Tag Cloud: 
A tag cloud is a weighted list in visual design and can be used as a visual depiction of content tags used on a website. In general, the more commonly used tags are displayed with a larger font or stronger emphasis (e.g. see example from del.icio.us). Each term in the tag cloud is a link to the collection of items that have that tag.
The Long Tail:
A writer for Wired Magazine, Chris Anderson, has applied this statistical concept to web businesses (the long-tail represents the outer parts of a bell-curve). For example, a brick-and-mortar retailer could not justify stocking products that have minimal demand (at the long-tail). However, etailers like Amazon.com can essentially have unlimited shelf-space and thus benefit from long-tail market opportunities.
Trackback:
Trackback is a method for web authors to request notification when somebody links to one of their documents or web pages. Trackbacks are used primarily to facilitate communication between weblogs.
This can be an effective way to network with other blogs – and perhaps get more exposure as well as search engine optimization. The downside is that it could be perceived as spam (especially if the trackback is not relevant to the blog).
User Generated Content(UGC):
UGC refers to various kinds of media content that are produced or primarily influenced by end-users vs. traditional content publishers. This is a broad term that describes online tools that allow users to share and express content, such as blogs, wikis, and podcasts.
Web 2.0:
Web 2.0 has been a difficult term to define and it continues to be a moving target. Tim O'Reilly, the founder of O'Reilly Media, coined the term Web 2.0 in his article “What Is Web 2.0.”
Early entries into the Web 2.0 market were primarily a consumer phenomenon. However, this is rapidly changing. Blogs & Wikis are starting to pop-up within enterprises at the departmental and individual levels. Technology leaders like Intel and IBM are developing new platforms built primarily on Web 2.0 technologies for the corporate world and CIOs are starting to see the value in deploying flexible and smaller footprint web-based applications that encourage interaction & collaboration.
Web 1st: 
As the Internet continues to grow in users, and e-commerce spending increases, the emerging trend for the majority of marketing and advertising strategies is one simple goal; " to drive prospects & customers to a web site".
Widgets: 
Many of the Web 2.0 concepts promote a "do it yourself" attitude. Widgets are portable & reusable pieces of software code and are a key enabler of this type of development philosophy. A widget is anything that can be embedded within a web page. It is not intended to be a complete application but rather provides a specific feature that can be re-used by other applications.
Dion Hinchchliffe, a noted Web2.0 analyst has frequently blogged on the rational for developing Widgets and the business justification for them.
Wiki:
Wikis are websites that allow users to simply create, edit and collaborate on content. The word Wiki is a Hawaiian word meaning "quick". A wiki's ease of interaction and operation make it a great collaborative authoring tool for non-technical users.
One of the best known wiki examples is Wikipedia.org, which is an online encyclopedia that leverages the knowledge of thousands of people across the globe.
Here is a link to an interesting video explanation of a Wiki by Common Craft.
