I thought all you airheads might enjoy this article on biplanes. Not all are from WW I, but a few are (in the photo gallery about half way down the page)

This magazine is really good if you're at all interested in aviation. I've been a subscriber for about 20 years. It covers everything related to air and space (thus the name).

http://www.airspacemag.com/history-of-flight/Biplanes-and-Us.html