CAD at the nanolevel
I saw this on a blog today and thought it looked interesting. I love pretty much everything CAD related, but this stuff is way over my head. Its got to be exciting for the scientific community. Looks like it will be open-source as well.
http://nanoengineer-1.com
NanoEngineer-1â„¢ is an open-source (GPL) 3D multi-scale modeling and simulation program for nano-composites with special support for structural DNA nanotechnology. It features an easy-to-use interactive 3D graphical user interface for designing and modeling large, atomically precise composite systems.

