Other
The Luftwaffe, 1933 1945
A site containing information on the German WWII Luftwaffe, including organization, types of aircraft, articles, and lots more. Much of it is quite technical.
National Archives (UK)
National Archives Learning Curve: British Response to V1and V2
A lesson plan (including primary documents) on how you as an advisor to the British War Cabinet would try to counter the threat of the V-1 "Buzz Bombs".
Other
The Luftwaffe
This page provides links to a great deal of information on the German Air Force, the Luftwaffe of World War II. It even presents popular German war-era songs.