Picked this up in a comment on our Intrade post that showed Obama will win the nomination and Presidency. Bet2Give is a similar site, but actually lets you give money to charity while investing and growing your account:

bet2give is a real-money prediction market where you grow your account with investments in smart predictions about the future, and give your winnings away to non-profit organizations of your choice.

Even has cool widgets that let you display the current results on your e-enabled Internet powered website:

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