www.lowlimitomaha.com is a good place to start.

omaha hilo doesn't have any dominating hands. omaha hi does have some, but a lot fewer. actually i got screwed once going all in preflop (omaha hi). i had AATTds, vs KK27....well according to a hand simulator i was a 3 to 1 favourite to win. i'm surprised...i was expecting more of a 4 to 1 like AA vs KK. of course the guy got a K on the flop and beat me.

omaha is definitely a lot funner than holdem i think....once you're playin a hand. the swings seem to be a lot more however on the bankroll.