* Acroname - Robotics kits and components supplier, nice selection of robotics books, too.

* All Electronics, Inc. - Lots of surplus stuff. Battery compartments, LEDs, cables, power supplies.

*Centerpointe Electronics - Kits, bulk diodes, capacitors, resistors, relays, potentiometers. Geared to small volume buyers.

* Circuit Specialists, Inc. - Distributor of robotics kits, discrete components, soldering, power supplies, PCB fabrication supplies

* Digi-Key - "Digi-Key offers over 600,000 components from more than 300 manufacturers." (Quote from Digi-Key's website)

* The Electronic Goldmine - HUGE variety of electronics components, many unique products.

* Flexible Circuit Technologies, Inc. - "Flex C Tech designs and manufactures flexible circuits used in a broad range of applications and markets from industrial controls to computer peripherals, to medical equipment." (Quote from FCT's website)

* Hobby Boards - Supplier of home automation, "yard & garden" and weather sensing boards, kits and components, all of which utilize the 1-Wire bus.

* Hobby Engineering - "A supply store for people who want to build robots, electronic gadgets, kinetic art or anything else that moves, beeps or flashes." (Quote from Hobby Engineering website)

* HVW Tech - HVW Tech supplies a large variety of robotics, embedded systems development tools, texts, radio frequency components, and more.

* Jameco Electronics - Electronics supply house, including ICs, kits, electromechanical components and books.

* Logical Systems - IC adapters, great for prototyping.

* Mark III Robot Store - Robotics kits, sensors, servos, gear train packages.

* Marlin P. Jones - Yet Another Mega Electronics Supplier, kits, motors, mechanical components, TV, telephone, solar panels, lasers, lenses, connectors, fans, and so forth.

* Maxim - Integrated Circuit supplier. A huge variety of IC environmental sensors, digital potentiometers, power and battery control ICs, hugs amounts of reference material and sample interface code, I2C, SMBus, SPI, 1-Wire

* Mouser, Inc. - "Customers can view more than 435,000 supplier data sheets, as well as over one million cross-referenced parts online." (Quote from Mouser's website)

* Multilabs - Embedded VGA Graphics controller chip. Serial-command driven NTSC and VGA color video cards specifically geared to embedded systems. LCD and Touchscreen products. PS/2-to-Serial keyboard and mouse interfacing hardware.

* Newark - prototyping, components, optoelectronics. Distributor for 440+ suppliers.

* Pololu - Robotics kits and components supplier, plus tools and a custom laser cutting service.

* Round Solutions - United Kingdom-based manufacturer and distributor of industrial communication technology specialising in the GSM GPRS modem-module, GPS module, GSM GPS antenna and RF cables. Bluetooth modules, also available.

* SchmartBoard - prototyping components and services for all types of mounting technologies, including through hole, SMT, BGA, and a community forum.

* SmallParts - The Hardware Store for Researches. A lot of small hard to find hardware. Has the small screws that fit the gumstix boards.

* SparkFun - Robotics components, cellular modules, GPS modules, custom PCB fab, custom enclosure fab, great tutorials, support forums.

* Super Bright LEDs - High intensity LEDS and kits.

* Timeline, Inc. - Mostly LCDs and some other miscellaneous components.