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I know that it's not exactly in the same industrial ball park as, say, Eve Online or the old Star Wars Galaxies....
But I know a ton of people who find Kapilands (http://www.kapilands.com) a fun, challenging diversion.
Its a MMO, maybe the Roleplaying element is not as deep as other games, but you still play the part of a budding industrialists and compete or co-operate with other players in real time, and there's no pause button... IMO (NSHO?) that makes it an MMORPG.
Its free, I love it... check it out.