Paper Space... Model Space... Earth Space
Avatech released an earth connector for Autocad back in January which allowed a model to be exported into the Google Earth file format (KMZ) and placed in "earth-space" using GIS coordinate data held in the model. Now they have done the same for Revit - which is Autodesk's main BIM solution in the mechanical and electrical space.
Revit also has support for the BuildingSmart IFC standard, as was confirmed to me when I put the question to Paul Stefan of Autodesk after he gave an end-of-day presentation about Revit BIM to the IT Construction Forum annual conference back in May. I know Paul from 2000 when we were colleagues at Citadon. He confirmed that Revit had "been on-board with standards since the beginning".