These are free online books on Nanotechnology:
Engines of Creation - The Coming Era of Nanotechnology
Author(s): K. Eric Drexler
http://www.foresight.org/EOC/index.html
Unbounding the Future: the Nanotechnology Revolution
Author(s): Eric Drexler and Chris Peterson, with Gayle Pergamit
http://www.foresight.org/UTF/Unbound_LBW/index.html
Nanomedicine
Author(s): Robert A. Freitas Jr
http://www.foresight.org/Nanomedicine/index.html
Leaping the Abyss: Putting Group Genius to Work
Author(s): Gayle Pergamit and Chris Peterson
http://www.foresight.org/SrAssoc/99Gathering/lta_toc.html
The Global Technology Revolution: Bio/Nano/Materials Trends and Their Synergies with Information Technology by 2015
Author(s): Philip S. Antón, Richard Silberglitt, and James Schneider 2001 RAND Corp.