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Not sure if anybody wrote this before, but in my homegame we sometimes play hold'em, omaha and CP with 2 or 3 (2 recomended) flops. You bet into the same pot, and if you win 1 of 2 boards you simply win 50% of the pot. Pretty easy, but still adds a lot to the game.
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Double-flop Hold'em is well-known:
http://www.pokernews.com/poker-rules...lop-holdem.htm
(Heck, even Wikipedia mentions it.)