[GoNi]

I did a little google search for Free MMOs and found some sites that may be good for banner advertising

PCGames

http://www.fatfoogoo.com/Start/

http://web85.login-2.hoststar.at/start.php

http://www.onrpg.com/games_categories/free-mmorpg.html

http://www.freemmorpglist.com/

http://www.globalmmo.com/

http://mmolist.blogspot.com/

http://play-free-online-game.co.uk/

http://www.mmorpgtoplist.com/

http://www.mmorpg100.com/in.php