www.toribash.com
Best fighting game ever. Ever. And it's free.
Turn based, with sorta neat physics engine, and you can rip heads and limbs and such off each other. So it's totally like chess meets Mortal Kombat, 'cept it's cooler than either [img]tongue.gif[/img] Great fun, anyways, both single (no AI, so single player = trying to make cool moves and posting the replay somewhere for showing off) and multiplayer (probably clever to practice some in single player first tho).