Xiaofei Sui, Germany's resident Rhythmball expert, did the bulk of the work, having already written version 1.0. It was a great project, translating his original work and adding my own spin on some of the topics, with his blessing. If you're already playing Rhythmball, Fundamental Rhythmball will help you fine-tune your grip on the racket. Xiaofei has also included two warm-up and cool-down exercises to underlie your game.
Click here for the download page. You'll need Acrobat, aka Adobe Reader, 'cause it's a .pdf document... And don't forget to set your printer prefs to "landscape" mode.