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