I have been through www.wildlife-photos.net and the 40D was the highest used followed by the 1D4
I noticed that too - although it's nice to see what the 40D can do with a giant lens attached!
I wish I knew someone with a 1DS so I can try it out for myself. Not much chance of that though. I even contacted the largest camera store in my city to see if they had any left, and the answer was a definite 'no'.
Where do you you live?