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.
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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:
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