There's this awesome site called bitmadness that has free and community contests for bitcoin.
Right now they have this MLB survivor pool.
Basically you pick a different team every week and if they lose 4 games in that given week you are OUT.
Last man standing wins.
The free one is past it's deadline, but if there's interest we could do a PokerOwned one for like .1BTC (100 SWC chips) per entry.
Check it out. Bit Madness: Free MLB Baseball Survivor Pools with Bitcoin