Just letting you know http://www.bitmadness.com/
is back with another free bitcoin basketball pool: this time, it's the NBA playoffs!
There's a 20 BTC pot and no entry fee, so what have you got to lose?
There's also a 1 BTC entry fee pool with an extra 10 BTC added to the pot.. why do that one? Less competition means more likely to win!
And as before, if you refer people to any pool (using the link you'll get when you visit the pool), if they end up winning anything you get 10% of their prize money for referring them!
Oh yeah, and you can of course create and run your own private pool(s) using bitcoin or cash, for free!