Cool pics, I love horse race shots. I stand about the same distance away with 30D and 135mm for approach to finish shots. Good for a couple of horses in the frame.
I like tight racing shots mostly, theres some serious jockey expressions and the horses are just beautiful.
I love to watch the grey horses run, Thats one of the nicest grey's I've seen.
Quarter horse is fun too, 300 yard dash, alot of emotions there. Also, if its muddy, when the jockey is done walkin away from winners circle, get some good shots of their face all mudded up
Thanks for sharing!!