DodgeBots is a 3D browser game where you compete for actual cash and prizes. Players each put a bit of credits in to play and the winner takes the pot. Players can pay for numerous upgrades including (my favourite) a smaller bot which is harder to hit by the player-controlled turret! DodgeBots is the brainchild of Ivan Lukianchuk at Will Pwn 4 Food.
I'm very happy to announce that the game has just started accepting players for its closed beta test phase! If you're interested in giving this game a go, sign up at dodgebots.com, wait for notification of the next beta test, then come play! It's hella fun.