Are you interested in testing and providing feedback for a technology preview of a lighter version of Revit? If the answer is “Oh YES!” check out these links!

Autodesk Labs Project Spark http://labs.autodesk.com/utilities/spark/
More information is available on the Project Spark Wiki page

Project Spark is a technology preview of a simplified 3D building information modeling (BIM) solution. Using Project Spark, building professionals can create designs efficiently with real-world building objects, produce more reliable documentation faster, and share files with consultants using Revit or AutoCAD-based products.