Michael Berger from Nanoblog at Nanowerk Nanotechnology Portal has filed a report on the latest efforts by scientists to understand risks and benefits of transdermal absorption of nanoparticles.
Link: Nanoparticle penetration of human skin – a double-edged sword …
Nanoparticles Synthesized for Skin Applications: Pros and Cons
April 24th, 2007 
Medgadget Editors Nanomedicine, Society