Useful Links

Bay Area Hobby Supplies

Hobby Engineering

Berkeley Ace Hardware

Electronic Kits

Goldmine Electronics   Electronix Express

Jameco   Elenco   Quality Kits

Electronics123   Solarbotics

Electronics

Digikey   Mouser

Mechanical

McMaster-Carr   Small Parts

Materials

Tap Plastics   Online Metals

Springs

Century Springs

Controllers

Sparkfun

Instructional

All About Circuits (really useful)

Make Magazine   Instructables

Discover Circuits  Schematics

Adafruit Sparkfun

Robot Components

Pololu

Arduino stuff at NKC Electronics

The Original Arduino Website