up at the Virtual Worlds Forum Europe is Paul Ledak, who's one of IBM's virtual world gurus. He's explaining the important (if you're in the virtual worlds business) of interoperability. He's kicking off with a personal example: creating a house in a virtual world, with an eye to building it in real life (I think). So, you start with a 2D floorplan design, and have to turn that into a 3D form - maybe via an architect who visualises it for you, in partnership with an interior designer. "At the end of the day, there are many different people involved in putting this together."