This is hard. I knew it would be, but it's still hard. Here's my favorite out of the 120 or so shots I took. Click the photo for the flickr set to see a few more.
I like this one too:
It's amazing the difference in quality between the 70-200 f/2.8 and the variable aperture 20-35. I have a nicer wide angle zoom that should be arriving in the mail tomorrow. The two I posted here were with the wide angle but check out the telephoto shots in the flickr set for a huge jump in quality.
On second thought, just look at this one...
Some of you might notice the special "gadget" used by one of those female riders.