I thought about that, too, but the Stan's website put me off the idea. The instructions page made my head spin (drill and de-burr the inner side of the valve hole...), and there's no list of recommended cyclocross tires like there is for mtn. An article I found about how "easy" Stan's system is had like 35 tips on how to properly care for them.
It seems like a great idea, but I don't want to spend fifty bucks on the kit and then screw up my wheels, or have it not work with my tires. I'll just keep watching ebay/craigslist for a cheap pair of tubular wheels and save up for some nice tires.