Mel Bay has a introduction to the cajon book called "Mel Bay presents Studies for Cajon" that I haven't seen, but have heard was decent. Also, you can check out some of the youtube videos like:
[ame="http://www.youtube.com/watch?v=v-IMARby9gA"]YouTube - Jen's Meinl Pick Up Cajon[/ame]
BongoCajon may have more resources than I do....
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