This has got to ba a good thing – a rival for Googl;e Sketchup.
SDVia shape is the simple 3D design tool that Microsoft recommends for use with Bing Maps (was multimaps). It looks quite easy to use – probably easier than Sketchup.
I also took the opportunity to look again at Bing Maps with 3D tilt and rotate built in – very nice. It now has a pinning feature that is probably better than Googles at the moment.