Swedish technical guru Jimmy Bergmark posted a nice overview of some of the changes in the free Autodesk Freewheel project from Autodesk Labs. Note to Jimmy, lookout some have an issue with the "Collaboration" word but what other word would you use to describe it, perhaps "working-together mode"? :-)
Jimmy showed some examples of the sketching, Impression styles, navigation, and callouts. Pretty cool stuff for both 2D and 3D design data.