Numbered USAF Historical Studies
The historical studies listed on the following pages have been prepared primarily for use within the Air Force, but are available for loan or purchase under certain conditions
http://www.au.af.mil/au/afhra/number...udiesintro.asp
Looks like the USAF Historical branch is doing overtime. You can find a great number of interesting studies in PDF-format. Unfortunately at this stage they do not include the Luftwaffe studies.
EDIT June 7th 2006:
It looks like the US
Air Force Historical Research Agency has changed their web site.
All URLs have now been updated to reflect these changes.
Here's a link to their main page, which lists a number of very interest subjects. Be sure to check them all out!
http://www.au.af.mil/au/afhra/
AFHRA is a shining example of how things can be done, if only all official agencies would follow suit.