Report from the Center for Social Media on fair use for user-generated video, examining the different types of videos commonly created and how they are generally protected by fair use (PDF)
The Educational Remix- At Odds With Copyright? | nashworld
Interesting use of Animoto (which creates music videos from a collection of images) with text to create a presentation about the author of a book. Includes a description of how the presentation was created. This does raise some questions of copyright though. Does this count as a sufficiently transformative use of the song to be included here? I'm not 100% convinced; I probably would have found something from Magnatune or elsewhere that was CC-licensed.