This game on greenlight looks super rad
http://steamcommunity.com/sharedfiles/filedetails/?id=137985019
"Krautscape is an action-packed multi-player racing game with bird-like flying cars. The leading player is actively building the racetrack while the chasing players can take shortcuts by flying off the track to overcome obstacles. But the track is needed to score and to get speed – the vehicles don't have any thrusters to accelerate while flying. The three gamemodes are designed to support nonlinear gameplay and intelligent movement instead of forcing you to drive perfectly. Krautscape is currently in development for Mac, PC and Linux."
@TheVoxelman on twitter