Make: Electronics (Learning by Discovery) A great first book for the beginning electronic enthusiast.
Make: More Electronics: Journey Deep Into the World of Logic Chips, Amplifiers, Sensors, and Randomicity A great second book. It adds to what was learned in the first book. I have this book to still be handy to near the workbench!
Encyclopedia of Electronic Components Volume 1: Resistors, Capacitors, Inductors, Switches, Encoders, Relays, Transistors This book is really helpful for solid information pertaining to a particular component. And you can trust it, where Wikipedia info must be taken with a grain of
The Art of Electronics The electronic Bible for all engineers/technicians.