Books, Magazines, DVDs
Popup Times Magazine
http://www.popuptimes.com/index.php
Backpacker Magazine
A favorite magazine of mine that inspires me to camp better
Popup Camping 101 DVD
The best overall DVD I've found
http://shop.rveducation101.com/pop-up-walkthrough-dvd-p22.php
Check out the books at the popupexplorer bookstore