Ryan Gallagher has written this article - Camera Toss: Mini-HOWTO
The concept is extremely simple, and the following summary is probably even more detailed than it should be. Basically just take pictures while throwing your camera and use trial and error to hone your results. That being said there is a whole spectrum of directions you can take this. It is after all, a photography technique, and can be applied however you desire.
With a little practice you too can achieve results like these!
. . . and if you really get into it, you can join the Flickr Camera Toss Group
