In-Revit Solar Radiation

Use the Solar Radiation Technology Preview to analyze the effects of solar radiation on various surfaces of your conceptual building model...

http://labs.autodesk.com/utilities/ecotect/

Revit Arch 2010 Update 1

The first Update for Revit Arch 2010 is now available...

http://usa.autodesk.com/adsk/servlet/item?siteID=123112&id=12828862