A very highly developed MUD that can be found at www.avalon-rpg.com. It is complicated and has been around since before the Internet. I had a tiny bit of creative input myself and have a character called Kazaroth who I, very occasionally these days, log on.

The aim of the game is to become a god. Is that like E2 then? :)

The game is set in your standard medieval style world with more than a good dollop of Tolkein - e.g. Uruk-hai, Wargs and so on. It has a highly developed and complicated combat system but don't worry, you are protected the first 5 hours of play.

There is often a quite hostile atmosphere and a lot of very ambitious people play it. Try to find some people from the same town as you to start with.

The weirdest thing is that is has a fairly high regular player base (for an entirely text-based MUD) and yet it costs more to play than Ultima Online or Everquest. If you want to give it a try though, don't worry, you get your first 5 hours free.