A wonderfully creative person in Second Life by the name of Janeel Kharg has actually built a virtual version of Ankh-Morpork, with all kinds of interesting details, hidden ways, goodies and giveaways. Be sure to pick up a free map when you arrive so you can find your way around. To get there, use this SLURL. There are also some excellent Discworld Avatars available at the sim, which you can look at here.
