Star Wars Galaxies. Haven't had a subscription since the first 6 months or so it launched but I download the 14 day trial every few months and cry at what could have been.
Claydough, I have been looking for that game since I was about 6-8 years old. I have memories of playing it but I've never been able to figure out what it was. I'm really happy right now that I finally know what game it is!