Second Life is nothing if not an experiment. Second Life, developed by novice studio Linden Lab, is a massively multiplayer online game most akin on the surface to the upcoming The Sims Online. On the outside, Second Life is a fully 3D game where, as in The Sims, you control an in-game avatar, which you use to interact with the world. But the comparison really only provides a starting point to look at a game that is wholly different structurally.

Second Life Preview - Second Life for PC at GameSpot