Web 2.0 Tools--All tools that I discovered can be found from this link. I've highlighted some of the more useful tools below.
Prezi--basically, this is just PowerPoint/Keynote in a different format.
Animoto--create videos using this website.
Edmodo--basically, Facebook for teachers and students.
Today's Meet--temporary and safe online chat rooms for discussions.
TitanPad--allows people to work on documents simultaneously, anywhere in the world!
Wideo--create online videos for FREE!
More Web 2.0 Tools
...and more--seriously, this is probably the most comprehensive collection of Web 2.0 tools that I've EVER seen.
You can also upload and bookmark documents using Diigo. Below, you'll see a PDF that I've annotated.
https://diigo.com/076sk9 (copy & paste into browser)
Web Quests for Teachers
iCivics Three Branches of Government
Immigration Through Ellis Island