Hi folks,
as some might already noticed, I might work at this Google Summer of Code on a external 3D repository to store more detailed models of buildings and mostly every kind of public infrastructure and link it against OSM objects or OSM tags. I know it’s a quite huge task but I noticed that 3D comes more and more a topic on our community and the current results are already impressive
http://wiki.openstreetmap.org/wiki/GSoC_Project_Ideas_2011#3D_model_repository
http://wiki.openstreetmap.org/wiki/3D_Development