I'll also suggest EVE Online. I started playing it July 03, a couple months after launch, stuck around in Empire for eight months or so, then joined a great 0.0 corp, but life distracted me for a year. I resubbed in Jan. 06 and haven't looked back. I'm having a terrific time, still a part of the same great corp, and honestly don't see myself quitting any time soon. In EVE, everyone has a niche, and if you're willing to spend some time, you'll find it. If you are looking for the ultimate MMO, check out EVE. It's very brutal and unforgiving though and definitely isn't to everyone's liking.