I've played a lot of MMO (Massive Multiplayer Online for those out of the acronym loop) games in my time, and I've always looked for other that are interesting.
I've played the pay 2 play ones such as EQ 1, DaOC, Planetside (not an RPG though) and a few others that won't come to mind.
And I've played about a trillion free, open beta, private server games of all sorts.
I want to know if anyone might know of any more, I know of a few.
Such as Gravity's new R.O.S.E Online
http://www.roseon.com
Mu Online (popular Korean *i think* game)
http://www.muonline.com
Priston Tale (now in Gold, but free until lvl 39)
http://www.pristontale.com
and of course RO (Ragnarok Online) which I have mostly played only on Private Servers since the International P2P sucks big donkey nuts