Since the release of the new Canon EOS-1D Mark III camera, I've been reading complaints regarding its autofocus system. In particular, its ability to track moving subjects in AI Servo mode. I first saw these complaints on Naturescapes.net, but they have been popping up more and more on different photography web sites. Now, Rob Galbraith has written a comprehensive article on the autofocus issues that many users seem to be having with the 1D Mark III.
I'm not lucky enough to be able to afford a Canon 1D Mark III, but if you are, you should contact Canon if you are experiencing problems with the autofocus system. The more people report the issue, the more attention Canon will give it.
