I played this 2 days back and it was incredibly fun, it's not without it's flaws and it can be quiet annoying for the zombie team at times but i think we might as well give it a go, i mean we play wacky races enough
http://www.fpsbanana.com/games/2651
Dustbowl looks very great with this, they open the the entire map so it's one long slog to the end (the teams are switched i think cause i was defending as a surivor unlike in the vid)
http://wa-mx.net/2008/11/16/zombie-mod- ... ortress-2/