Latest from Autodesk Labs is an add-on for Revit MEP and Revit Architecture called Solar Radiation Technology Preview. Use the Solar Radiation Technology Preview to analyze the effects of solar radiation on various surfaces of your conceptual building model.
You can find links to a video and read me files on using the add on in the link above. Be sure to have Revit Update #1 for 2010 installed before using this add on.
