Autodesk recently developed a quick design/analysis tool called “Project Vasari.” The tool focuses on conceptual building design (parametric massing) and provides energy/carbon analysis results. Many of the analysis features are what you would find in Autodesk’s Ecotect and Green Building Studio products – the difference here is that it works seamlessly with Revit and the conceptual design process is far more intuitive (not unlike SketchUp). After you finalize tweaking the massing design, the Vasari model can be brought directly into Revit without losing any data. A free trial download of the software can be found here.
I am curious if this product will remain as a separate software tool or if it will eventually become part of the Revit bundle. Either way, it is a good step in the right direction.