Metaverse Master Tour by Gary Hayes
Virtual World Platforms | (3)
A fairly incredible video overview showing the range of virtual world platforms. Incredible both for the time it must have taken to compile and edit, but also for being able to remember the avatar names and passcodes for each of the visited environments.
(OK, sorry, had to put that in....it's a running pet peeve of mine that technology hasn't yet given me an easy, secure way of not needing to register and reregister, remember and...well, you get the idea, and don't get me started on LiveID and openID, I'm just saying).
In any case, the tour includes:
Second Life, HiPiHi, Kaneva, Twinity, ActiveWorlds, ...