Possible, yes. (I'm running one, tho its more of a talker than a mud..) I'd link to an article about why not to write one, but it's in german.. ,) - Basically, there are too many half-started ones out there, and lots of good ones looking for programmers.

Did you want tips on writing MUDs in general, or on doing socket stuff in Perl? If its the socket stuff, I suggest you start by attempting to write a client first :)

C.