Mobile Robots Inspiration to Implementation
Joseph L. Jones, Anita Flynn
ISBN: 1-56881-097-0
available at the University of Patras's library

Robot Builder’s Bonanza
Gordon McComb
ISBN: 0-8306-2800-2
available at prof. Aspragathos' library (at mechanical engineering department, Patras university)

Design With Microprocessors For Mechanical Engineers
A. Kent Stiffler
ISBN: 0-07-112812-3
available at the University of Patras's library

The Unofficial Guide to LEGO® MINDSTORMS™ Robots
Jonathan Knudsen
book website (book is out of print)
free chapter
Also see the section O'Reilly Articles for this author