Electronics Hardware + Supplier Links
LITTLE BITS OF EVERYTHING
Adafruit [Based in NYC - Arduinos, Sensors, Wireless, DIY Central, great range of things ...]
Jameco [outside SF in Belmont, CA - Huge selection of Electronics]
RobotShop [Huge selection of robot-based electronics, SMAs, Motors, Sensors]
Al Lashers Electronics [Located in Berkeley, CA -1734 University Ave (510)843-5915]
Electronics Plus [San Rafael, CA - (415) 457-0466]
Fry’s [1077 East Arques Ave. Sunnyvale, CA, 408.617.1300 - also in Palo Alto, San Jose and more]
ARDUINO + ELECTRONICS SUPPLIERS
Arduino [mothership: great links to everything Arduino]
Sparkfun [sensors, hardware, kits ...]
MakerShed [sensors, hardware, kits ...]
LiquidWare [lots of everything]
GENERAL ELECTRONICS
Marlin P. Jones [Huge Supplier including Power Supplies, LED, Connectors, etc]
POWER SUPPLIES
PowerSupply1 [Huge Selection
SENSORS
Acroname [Sharp IR Sensor Source - we use the GP2Y0A02YK]
Making Things [Great range of Sensors - highly recommend]
Sparkfun Sensors [many flavours]
LadyAda [Bits and Pieces]
SERVOS
Servocity [Great Selection of Servos and Supplies]
LEDS
SuperBrightLEDS.com [Single LEDs or multiple strings, all types, good quality]
LED Circuitry Tutorial: http://www.theledlight.com/ledcircuits.html
LED Calculator: http://www.led-calculator.com/
GOOD ARDUINO BASED KITS
Sensor Kit by Sparkfun http://www.sparkfun.com/commerce/product_info.php?products_id=9383
GENERAL
McMaster Carr [The Godfather --- Huge selection of everything]
US Plastics [Based in Ohio - Great Selection and reliable]
GEARS + MECHANICS
Flying Pigs Mechanisms [Database of Mechanism Types]
SENSOR + ARDUINO TUTORIALS
FSR (Touch) Tutorial from Lady Ada
PhotoCell (Light) Tutorial
SKILLS
Great Soldering How-to Links