Google SketchUp is getting an alternative it seems with the latest Virtual Earth 3D from Microsoft.
"3D Modelling. We partnered with Dassault to create a new application to allow anyone to create 3D buildings and other objects in Virtual Earth. 3DVIA Technology preview allows you to create textured buildings and save them directly into your map Collections. This technology preview is the first 3D modeling offering between Dassault and Microsoft. We’re looking forward to community feedback from this release to help shape 3DVIA as it moves from technology preview to a first official release. "