Past winners:

None, since Jan '11 will be our 1st tournament!

What do I get if I win?

There's no prize really, except saying that you slaughtered your opponents mercilessly then sent them to the Shadow Realm(?). But if you enter another tournament here, on the Ladder next to your name it will state that you've won (eg JAN '11 - WINNER) or come 2nd, and your name will stay on here for good. I'm sorry that I don't have much to offer, but I might be able to sort something out later.