Here are two good pieces that address the broader ethical implications and political consequences of nanotech and open source:
Revolution in a Box: the Center for Responsible Nanotechnology also has a good discussion on whether open source is feasible for nanotech production, and how it may provide for a more or less ethical brakes in nanotech.
Convergence brings together various luminaries, academics, and acitivists who participate in various social movements, that while distinct, all concern the law of intellectual propert. Here these folks provide us with some thoughts on some of the broader implications of open source in shifitng the global politics of IP.