If you've never considered flat track racing, this should change your mind.
Watch as pros, enthusiasts, regular joes, women, and kids all slide (or crash) their way around a short track in this cool little video from Roland Sands Design. As you can see, races range from full-on built race bikes down to run what ya brung street bikes to pit bikes. If you look closely, you can see guys like Aaron Colton, Adam Waheed, and Jamie Robinson riding alongside Roland.
I've been dying to get back in a mini bike race after the BA Moto race, and after watching this, you can be sure I'll be at the next flat track race.