If you've never heard of 5 card omaha, you can find it and play it at Point Poker
Here are the rules (as laid out by Point Poker):
5-CARD OMAHA
Players
Up to 8 players are allowed to play in the same table.
Dealer
In Omaha a button (the "dealer button") indicates who the dealer is. The deal moves clockwise between the players.
Blinds
Omaha is played with two blinds, the "small blind" and the "big blind". Before any cards are dealt the blinds must be posted. The player to the left of the dealer posts the small blind and the next player in turn posts the big blind. The blinds are considered as "live" bets. If you have posted a blind you are only required to make up the difference, if any, between the blind and the current bet. The players in the blinds have the option to fold, call, check or raise in turn.
Deal
Each player receives 5 cards dealt face down. These 5 cards are called the "hole cards". After that there will be 3 community cards dealt face up on the board, "the flop". Then another community card, "the turn" or "fourth street" will be dealt. Finally the last community card, "the river" or "fifth street", will make it 5 cards showing on the board.
Betting order
In Omaha there are 4 betting rounds. The first betting round takes place after each player is dealt his hole cards. In this round the player to the left of the big blind is first to act. In the following betting rounds the first active player to the left of the dealer button starts the action.
Showdown
If no more betting takes place, after all the cards have been dealt out, there is a showdown to determine the winner. The best 5 card hand wins the pot. The players must use exactly 2 of their 5 hole cards and 3 community cards. If two or more players show the same hand they split the pot. If there was betting on fifth street the player who made the last bet or raise must show his hand first. If there was no betting the first remaining player to the left of the dealer shows his hand first.
I've never played this game however it does sound quite interesting and I imagine there are some amazing hands in this game.
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