PD book

[K9 Kai Niggemann]

I don't know if any of you are into PD that don't know the basics  
already, but I came across this book that is the first coherent  
tutorial that I found on the subject and bought it and have been  
having quite a bit of fun with it since:

http://createdigitalmusic.com/2009/03/18/be-a-music-geek-ninja-with-electronic-music-programming-in-pd-new-book/

the whole book including the example patches is available as free  
online content, too.

Kai