World Builder by Bruce Branit. A strange man builds a world using holographic tools for the woman he loves. There's more at Not Possible in Real Life, dedicated to identifying and sharing well conceived and realized content creation in Second Life® that would not be possible in real life.
Worldbuilder (no relation to the old Mac adventure game toolkit) is an excellent way to start off the week by completely crippling productivity. I've played many games from these guys before, and they're always great. I envy the independent game designer that gets to work with Lego so often. Via GTA.