This is pretty good stuff.

"University of Michigan scientists have created the nanotechnology equivalent of a Trojan horse to smuggle a powerful chemotherapeutic drug inside tumor cells – increasing the drug's cancer-killing activity and reducing its toxic side effects."

www.med.umich.edu/opm/newsp...ticles.htm

There some groups in France and Belgium who have done some fantastic work... its nice to see some good things happening in the USA as well.

The Journal of Controlled Release is a good source for related articles.
Poupaert and Couvreur, JCR, 92, 19-26, 2003.
Vauthier et al, JCR, 93, 151-160, 2003.