Here at FBE we have a growing usage of a wider set of the Autodesk toolsets. It was interesting to hear that Autodesk had acquired the Ecototect software which we also use and we look forward to see its integration with the other products like Revit soon.
The Autodesk site (and their products) have a growing emphasis on sustainable design - check out things like their Autodesk Green Building Studio and their Sustainability Center.
Plus you need to watch the video on their Green Building Research article. I am sure I linked to a similar one previously - gotta love that screen!!