Feel free to add content for our Library 2.0 Smackdown!

In B flat is a YouTube music project. Not so much a tool, but a project that I think students could replicate in a number of ways. Inspiring use of Flip cameras combined with any service that let's you embed videos.

Cobocards - http://cobocards.com/ create and study flashcards - alone or with your friends

SHMOOP Great research guides on a variety of topics!