I just launched a new website a few days ago at:
www.bittrivia.com.
You can compete against other players answering trivia questions.
After you make an account (quick and anonymous), you can send bitcoin to the btc address shown under your name to deposit money to the site. Or you can play a few rounds without bidding to see how it works. During the guessing phase, try to answer the question as fast as you can - either from trivia knowledge or from being able to google quickly. If you're the first person to correctly answer it, you win up to how much you bid from each of the other players. It is also possible to win if you didn't answer it first, if there is still money left over in the pot, and you bid higher than the first person.
The way it works is similar to poker with side pots. If the first person to correctly answer bid 0.01 BTC, they are entitled to up to 0.01 BTC from each player. If the second place person bid 0.02 BTC and there is money still left in the pot, they can get bitcoin up to the amount they bid from each player - and so on down the line. Money left over in the pot is returned to the players that bid it.
After you are done playing, you can cashout to any bitcoin address. Cashouts are instantaneous so long as there is at least one confirmation on your deposit.
Check it out, it's a lot of fun!