I've been playing HellMOO a bit and I like it, but I don't want to settle for the first decent game I've found now that I'm back into MOOing a bit.
I'm thinking about digging into a Star Trek MOO but I only found one so far (Where No One Has Gone Before) and it turned me off in a big way, at first. I like a MOO where the coders have made a daunting number of game features.
But regardless of genre (read: even if it's a fantasy setting) -- what are your favorite MOOs and how deep is the programming?
No offense to those of you on games like WNOHGB who prefer to type out their RP more often than letting the game system decide what happens - it's just not what I'm looking for this month.