Yeah, check EVE Online out if you like falling asleep at the screen, or if you like a little interactivity with your screensaver. You want the REAL Elite-type MMO, take a look at Jumpgate, a game I've been playing for 4 years, and one that will give your joystick a workout rather than your mouse
http://www.themis-group.com/jg/
Oh, here's my review of the game, to give you an idea of what it's like:
http://www.wargamer.com/reviews/jumpgate/
Enjoy!