Need a book on simple, effective robotics? This is the one! Written by Solarbotics' founder Dave Hrynkiw with contributions by Mark Tilden
Intermediate Robot Building by David Cook covers all aspects of robot building, from mechanical, to electronics, to microcontroller selection
Written by Massimo Banzi (the co-founder of the Arduino Project), this nice little handbook walks you through the open-source hardware/software project that is Arduino!
Simply, the best introductory book into electronics you can buy. Inexpensive, detailed, and easy-to read. Get it! Get it now, now, now!