Whitewater Kayaking Boof Instruction Videos
2014 Update: I have a newer post with a fantastic kayak boofing and flaring video tutorial that I highly recommend. Also, one of the videos below stopped working so I had to take it off this post.
Shane Benedict from Whitewater Instruction has some nice whitewater kayaking how-to videos on Vimeo, here are two that I found on boofing.
This one talks about boofing in general: