"The Best Paper Airplane in the World"
(not RC, but a link to a nifty high performance paper airplane design, with full construction notes, pictures and all!)

A. A. Lidberg Model Plan Service

D&L Designs
Model Aircraft Plans and Kits

Delmar Brengman's Foamcutter Plans

Hostetler Plans

Joe's Airplane Model Plans Site

ModelAir Tech
(electric kits, semi-kits, plans, products)

Montana Modelworks
Offers professionally drawn CAD plans for electric park-flier size scale and sport planes. All plans are printed in color and include a second printout of all patterns - no tracing patterns or cutting up your plans!

Mugi High Performance Combat Wing
(a really neat site with online plans and active graphics to show how to build the Mugi, step-by-step!)

Palmer Plans

Pat's Custom Models
(speed 400 plans for direct-drive and geared motor systems)

Replicraft
Scale Plans for the Discriminating Modeler

Rich Harman's Paper Extra 300s
(A link to Rich's site with a complete plan for making a paper Extra. Why? He wanted to figure out paint schemes before painting 'the real thing'.)

Rick's RC Heli Products
Helicopter Kit Plans

Terminator HLG

Wendell Hostetler Plans

Winger Models