Aerospectra, Inc.
(RC frequency/spectrum analyzer)

Airtronics, Inc.

FMA Direct
Small receivers, all sizes of servos, ESCs, etc.

Futaba Corporation

Grand Wing Servo-Tech
(GWS - electric components, RTF's and kits)

HamRadio.com
(a site supplying scanners and other radio equipment, including the ICOM IC-R2 and IC-R10 that can be used as R/C channel monitors)

HiCam Aerial Photography
(an Australian heli photography company - interesting web site with lots of info, including an in-flight video transmission FAQ document)

Hitec RCD

HSC - Halted Specialties Company
("the techno-tinkerer's premiere high-tech shopping place")

ICOM America
(manufacturer of a wide range of scanners and receivers, including the ICOM IC-R2 that can be used as an inexpensive R/C channel monitor)

Jamara Modelltechnik
(CB-4FM micro, micro receiver)

Jameco Electronic Components

Molex Connectors

Multiplex RC

PlaneTalk Airborne Video Systems
(in-flight video with realtime downlink)

ProMark Electronics

R/C Aerial Photography
(distributor - in-flight photography systems)

Radio South
(radio repairs and sales of radio-related components)

RC-Direct
(distributor - Ikarus, Volz, Schulze)

RC Whirly Bird
Low-Level Aerial Video and Photography (site of the president of Fly Motion Cam USA)

Servo City
(Radio systems, servos, and a variety of robotics supplies)

Smiley Antenna Company
(distributor - hand-tuned "rubber ducky" antennas - home of the "R/C Power Duck")

SuperCircuits
(distributor - micro video cameras and on-board transmitters for real-time video feeds)

TNC Electronics
(tachometers)

Vantec
(remote control systems and components for robotic applications. Also known for their HitchHiker channel expander)

Volz Servos

Wireless Video Cameras
(distributor - wireless video systems)