"The Best Sources For Advice On Using Flip Video Cameras"
Thirty-Nine Interesting Ways* to use your Pocket Video Camera in the Classroom is a great online presentation from Tom Barrett.
7 Things You Should Know About Flip Camcorders is a good overview on using them in education.
Classroom 2.0 has a good discussion on its Forum about using Flips. I believe you can access it without being a member but, if not, it's free and easy to join.