Revit 2010 New Features: Family Creation

"VSTA macros, external commands, and external applications can create, modify, and manage Revit families."

Revit 2010 New Features: Export To gbXML

"Examine an analytical model of your Revit project before exporting the model to a gbXML file. The accuracy of energy analysis depends on accurately identifying surfaces and accounting for the entire volume of the building."

Revit 2010 New Features: Surface Analysis Tool

"A new surface analysis tool helps you correctly identify surfaces and openings by color-coding interior and exterior walls, windows, doors, floors, and roofs. With this information, you can then make adjustments to the model and perform accurate energy analysis."