Go to: http://web2010.discoveryeducation.com/web20tools.cfm. There are 7 videos at this Discovery Education site that is worth every minute to watch. In fact, watching this will allow you to start to understand what Web 2.0 is and how is can impact education.
Web 2.0 is about revolutionary new ways of creating, collaborating, editing and sharing user-generated content online. It's also about ease of use. There's no need to download, and teachers and students can master many of these tools in minutes. Technology has never been easier or more accessible to all.