Just when you thought you had a handle on the web, it went 2.0 on you. Well don't be discouraged, you already have an understanding of this new creature called Web 2.0 and probably just dont know it. Simply, Web 2.0 refers to a seemingly endless collection of new tools available on the web. These tools have been created to facilitate creativity, communication, and sharing between users. Allow me to provide concrete example: YouTube, Wikis, Blogging, Mashups, Facebook/MySpace and Skype. The term Web 2.0 was coined by Tim O'Reilly at the O'Reilly Media Conferenc in 2004.
Some of the 2.0 tools are more uselful and practical than others. In the classroom, you can easily bury yourself in 2.0 tomfoolery. The trick is to research what's out there, get to know what others are using and how they are using it, and ask yourself this simple question, "How can I use it to improve what I already do in class?"
Here is a remarkable site/directory that contains every current 2.0 tool out there.