Well, I took my new EOS-1D Mark II out for a spin today at my son's basketball game. 8.3 fps is awesome. I also like the ability to specify the ISO in smaller increments than the 20D (e.g. 1000 & 1250) versus jumping all the way to 1600. I'm still learning about the camera as it's quite a bit more complicated than the 20D.
I shot these at ISO 1000, f1.8, 800 shutter speed.