I've recently found this little gem of a game, and I thought I would share it with you:
http://www.toribash.com/
Basically, you are a little man with joints which can relax, hold, extend, or contract. You can rotate around your character in three dimensions and change what each joint is doing, all while time is frozen. Once you're ready, your character moves for a given amount of time (this depends on the fighting style) before freezing again and letting you change what each joint is doing.
Why is this awesome? YOU CAN MAKE YOUR OWN FIGHT MOVES! There are very few things more satisfying than successfully completing a spin-kick which decapitates your opponent.
The single player is great for messing around and getting used to the interface, but the multiplayer is definitely the best. There are all sorts of little alterations on the basic fight, like sumo (can't touch the floor outside a small box, very heavy body parts), kickboxing (fragile body parts, no boundaries), and jousting (you start out flying towards each other), among others.
This game is very unique, and I find myself analyzing my movements during the day to try and come up with new combos to use in it (the physics are very good, as far as I can tell!).
Try it out and tell me what you think. My account name is thegnome54 on there, so fight me if you dare :D