This is a great book! Very informative, inspirational and a great help to those with little electronic knowledge.
It contains simple synth designs, circuit bending tips and techniques, etc. as well as very avant-garde ideas and applications of music and sound.
http://www.amazon.com/Handmade-Electronic-Music-Hardware-Hacking/dp/0415975921 (http://www.amazon.com/Handmade-Electronic-Music-Hardware-Hacking/dp/0415975921)
Seek out a copy now!!!
I think we've discussed this before, but yes I do second this! it was my bible not too long ago, there's been a new edition since I bought it which includes a DVD 8)