Also highly recommended: the Rally Course set. you'd need like 10 packs of these buggers to set up a nice full-scale autocross in the server room

but I picked up 2 packs (that's all I could afford) and I've gotta say I'm happy with it too.
A bunch of crazy folks from the midwest region focaljet.com forums are getting together in columbia, MO on saturday. We're planning on setting up a drag race and autocross course for the micro RC's, but it won't exactly follow bit-dra-G rules, because very few people will be racing micros. It's definitely going to have a "Street racer" attitude.
Lots of fun. Might have to try the barrier sets later on.