I've been playing parkour games latley there's a new one coming out called "Brink"
another good parkour game is mirrors edge if you want to see how or what parkour is heres the link http://www.youtube.com/watch?v=9mzm6bj2j7Y&feature=fvsr
it really cool i think parkour should become more famous and well if you want good parkour mods here ya go " Pig_Extreme_Run , Pig_Spar " One revoulutionary parkour game is mirrors edge you should really check it out if you've never seen it