I'm putting together an article on folks who bike commute to 'cross races for Issue 10 of Cyclocross Magazine. I wish more people did it, and am going to try to bike commute to local races more myself in 2010.
Have an interesting story or a method or contraption for carrying all of your gear? Drop me an email ASAP, we want to talk to you.
I only did it once or twice. The contraption is called my car, driven by my wife. I think the key thing is timing the commute to act as a good warmup and then riding right home after! Or having dry clean warm clothes in your bag. But the aspect of driving two hours to race for 35 minutes doesn't feel right.