Modelling our world in 3D gets more and more important within the OpenStreetMap (OSM) project. There are several people in the community trying to push forward this development. A major problem is that OSM was not really designed for complex 3D modelling. The node/way/relation + tags based data model does not allow for complicated 3D modelling. Therefore, the community agreed to make use of external repositories containing more complex data which can be linked to OSM.
OpenBuildingModels is such a repository for complex architectural 3D building models. It is free-to-use and aims to improve crowdsourced 3D city models. Anyone can up- or download the models. They can be referenced in OSM and appear on the OSM-3D globe. A first beta version of the web platform is now online and models can be uploaded.
From APB and the official Google blog :
If you want to see screenshots of the event, CNET has plenty of them.