World War 1 Trenches on the Web - includes some excellent information and pictures of aeroplanes and airships, and even some VRML renditions. Modeling Page - includes a mailing list archive, and useful links to historical sites. Silhouettes of Aeroplanes - a 1917 booklet kindly scanned in by Pete Maller, containing contemporary photographs and sketches of Allied and German sircraft. This aviation museum in Krakow contains some rare German aircraft. More links and descriptions will appear here as time permits.
Feedback is welcome.