'Omania' is similar to the daily 'Bigs' or 'Hots' that pokerstars has, rather than Hold'em the 'Omania' tournaments are Omaha. There are 7 of the Omania tournaments every day with guaranteed prize pools ranging from $3000 to $10000.
Omania... I just heard about it, it's the password of the next online poker Show Freeroll. Was wandering what it meant. I don't know how to play Ohama, but definitely want to learn it anytime soon!