some great existing wikis outlining web 2.0 tools are at:-
top 20 web2.0 tools from larry
Best online learning games from larry
Directory of Learning tools - great list for educationalists
Great conversion program for lots o tools
Great post ononline publishing by Larry Ferlazzo

Fabulous wikis on web 2.0 tools
Ustream video on lots of online tools
Great blog post with many easy to use software tools
Webinair on Digital Toolbox
Tools to get to know better by coolcatteacher
Screencasts by lizbdavis for using various web2.0 tools
Great web2.0 tools for students
100 web2.0 classroom ideas