Back in September, Autodesk Labs retired the 2D to 3D Tool for Inventor. They must have had quite a bit of feedback wanting to bring it back because they have now ReReleased it back onto the Labs website.The only downfall is it is only supported by Autodesk Inventor 2013 64-bit.
The 2D to 3D Tool for Inventor allows the Inventor user to quickly create 3D models of 2D designed parts. The 2D to 3D Tool automatically transforms drawing views into orthogonal sketches, significantly streamlining the preparation of 2D views for 3D uses.
Here is a YouTube video made by Steve Bedder from Autodesk Manufacturing Northern Europe.