It would seem that Autodesk has acquired ECOTECT, which is great news for those of us using Revit. Details on the acquisition can be found here....
http://pressreleases.autodesk.com/index.php?s=press_releases&item=433%3C%2Ftd%3E
http://www.squ1.com/store/academic
ECOTECT is an industry leading building analysis program that allows designers to work easily in 3D and apply all the tools necessary for an energy efficient and sustainable future. If you want to know more about there product range go to http://www.squ1.com/.