I just stumbled across these awesome interviews with Mike Clark about Tony Williams. Highly recommended for Tony fanatics.
One really cool thing Clark mentions that I had no idea about was that Tony would practice playing quarter note unison strokes with all four limbs up to the fastest speed he could take them. After reading Ants' recounting Steve Smith talking about the value of that same exercise, I think we can safely say everyone should be doing it!
Part 1: http://youtu.be/Sroumdzu3c4
Part 2: http://youtu.be/UVztfbaT76s