If it's going to be a tournament (and hopefully we'll get enough people so it can be one, cause that'd be fun) what I was thinking is have a free-for-all qualifying round. The top 12 players would make it to the next round, a 6 vs 6 tdm with randomly assigned teams. The winning team would be split up and have a 3 vs 3 round. Then the winning 3 would have a free-for-all match. The top 2 players from that would have a best 2 out of 3 free-for-all. Other than the finals, I don't know how many games would be played in each round.
And, to make it even better, I was thinking of a $2 entry fee, with a $20 prize to the winner, and if there's any money left over, it can go to the site or something.
I'm open to suggestions, if anyone thinks my ideas suck.