www.ragnarokonline.com
It was beta test for a while, and I played during that time, and got so sucked in, that I was forced to pay when the time came for P2P [June 1st].
You all should play, its pretty fun, only 12 dollars a month [ok, ok, so it is a little expensive]
I play on Chaos and have a level 34/23 Swordsman.