Battle Organizations, Info Forums:

BotBash

BotBash Robotic Combat Forum

OverVolt.net

Battlebots

Robot Wars

SORC - Society of Robot Combat

Battlebots Forum

SORC Forum - Becoming Defunct

Robot Wars Forum (read only archives)

Sources of parts and supplies:

B.G. Micro - Surplus Electonics, etc.

C&H - Surplus Electronics and mechanical

Herbach and Rademan - Surplus electronic and mechanical, motors, etc.

Alltronics - Surplus Electronics, etc.

All Electronics - Surplus Electronics, etc.

Northern Tool - Tools, wheels, chain transmission components

Grainger - Industrial Supply

McMaster-Carr - Industrial Supply

WM Berg - Precision Gear Products

American Science & Surplus - Surplus motors, batteries, gears, pulleys, and ?

Palmer Pursuit Products - Custom paintball and CO2 equipment (GREAT guy!)

Industrial Metal Supply - The holy land. Great deals on remains stock and Steel and Al by the pound.

Team Delta Engineering - RC Interfaces, Motors and other combat specific robot parts

RobotBooks.com - Great collection of robot and electronic guidebook, fiction, toys, etc.

Surplus Center: 1-800-488-3407 - No website, but ORDER the catalog, you won't be sorry!

KCI - Carbon Fiber Composites and Robot Combat Friendly

Linco Casters - SoCal distributor for Colson Casters

Radio and Speed Controllers:

Team Delta Engineering - IFI ESCs, RC Electronic Interfaces to switches, h-bridges, etc.

Vantec - Tank Drive dual channel controllers

4QD - Single channel controllers with BIG power for a cheaper price

Tower Hobbies - Radios, batteries, chargers, small ESC's, etc.

Sites with "How-to's" and useful info for new builders:

Team Delta - Top 10 Questions Answered - Excellent overview!

Team Hercules Battle Robot Tips - Great detail and excellent graphical illustration of "Tank Drive" + more!

Coolrobots "Build a Robot" Guide - Step by step, it doesn't get any easier!

The Wedge of Doom - Tony B's excellent tips section. Good details on battery and charger tech. A must read!

Team Saber - Click on "Hints/Info"

Biohazard - A whole collection of valuable tips. Carlo is one of the undisputed masters of Combat Materials Engineering in this sport. He knows his stuff. Now you can know his stuff too.

Other Robot Builders:

I'm sorry to say that I've long since given up keeping an active list of all of the cool builders out there, there are just too many! So, I'll just list my current favorites and for a comprehensive list, please visit Jim Smentowski's EXCELLENT automated link system HERE.

Team Delta Battle Robots

Raptor Robotics

Team Coolrobots

Team Cosmos

Robot Warriors Team Minus Zero

Biohazard

Automatum

The Wedge of Doom

RobotCombat.com