Technology Books  
   Reviews of books about electronics, communications, signal processing (imaging, lasers, optics, robotics), technology in industry and society. Reviews written by consumers at Epinions.com.
   http://www.epinions.com/book-Science-Technology

WebBooks  
   Discount bookstore specializing in professional electrical and electronics engineering titles. Also provides author assistance in those areas.
   http://www.webbooks.net/

Techstreet  
   Source of technical books, standards documents and other technical information for engineers and scientists.
   http://www.cssinfo.com/