My World - Paper Airplanes
Free paper airplane diagrams and instructions. Many different designs by Alex.
OmniWing Paper Airplane
History, conception, and construction of the OmniWing Paper Airplane.
Papertoys.com
Free paper foldup toys for kids and grown ups. Just print, color, fold, and glue.
Print-n-Play Toys
Great assortment of paper toys that you can print and play with. Asks for small fee.