Vroom is a racing and vehicular-zombie-flattening game for iThings, Windows and (any day now) Mac, based on Shotgun Sunrise and made with the UDK. Drive your big blue truck around three zombie-infested tracks, boosting up half-pipes, catching mad air, and revelling in your extermination of the loathsome undead.
Meh. The vehicle movement makes it hard to drive and there are only three levels. What makes it enjoyable, however, is when you boost. Slow-mo. :D