I'd suggest Guild Wars and Diablo II. These are very good games, you just have to buy a copy of game and you can play online forever.
2 games that are available for beta testing and 1 full version: -http://www.gunzonline.com/ -http://www.softnyx.net/ (Gunbound and Rakion Chaos Force) Rakion Chaos Force beta opens August 11th
heres a couple nobody poster and is great but long downloads www.knightonlineworld.com www.muonline.com www.maplestory.com www.the4thcoming.cpm www.endless-online.com www.kalonline.com *beta) ENJOY!
Rose Online.. sorry if someone has said it already www.roseon.com << its an RPG, its OK..i used to play it
http://www.flashplayer.com/games/flashstrike.html greatest game ever counter-strike but in flash mode