Here are the ones I use most. If you have some or run across a good one post it here.
YakFace.com Toy Guide - Vintage
The Star Wars Collectors Archives
Vintage Photo Archives at Rebel Scum
Star Wars Super Collector Resources
Also, does anyone know where or have connections to the folks of Gadders.com which later became swinserts.com? That was a great site with loads of inserts and instructions both for viewing and printing.