Top Multiplayer Roleplaying Games

With MMORPGs getting so much attention these days, online computer RPGs that aren't massively multiplayer seem to have fallen out of favor. Guild Wars is one obvious exception to this, but there are some other great games in this category, and as they grow older they get even more affordable. If you just want a casual adventure with a few close friends, these titles will get the job done.
More: Guild Wars Review - Moving away from the EverQuest formula.