Share 'Best free MMORPG'

With the economy down, free games are always a good thing. But what MMO's are your favorite? A few that I like are... Anarchy Online: one of the better sci-fi MMO's out there, lots of interesting classes, best skill customization I've seen in a free MMO, a developed world and lots to do. Dungeon Runners: At first, seems like a cheap imitation of WOW, but then you notice the little things...