Re: Usning nanotech in a campaign
Michael, if you're stuck for sources of inspiration, the Nanotechnology in Science Fiction site has compiled a pretty comprehensive list of SF novels that feature nanotech in some way; the site owner even grades the novels according to the degree to which nanotech features in each book.
The Atlantis Rising sourcebook for the Conspiracy X RPG features a catalogue of nanotech devices, and is worth having a look at. I'd also suggest you have a peek at GURPS Ultra-Tech 2 and GURPS Bio-Tech.
I'd also highly recommend these pop sci works:
Unbounding the Future: The Nanotechnology Revolution Eric Drexler, Chris Peterson, Gayle Pergamit
Nanotechnology: Molecular Speculations on Global Abundance BC Crandall
Hacking Matter: Levitating Chairs, Quantum Mirages, and the Infinite Weirdness of Programmable Atoms Wil McCarthy
Nanofuture: What's Next for Nanotechnology J. Storrs Hall
The complete text of Drexler's seminal Engines of Creation can be accessed free at The Foresight Institute