A website you may find of interest
http://wp.scn.ru (Home Page)
http://wp.scn.ru/en/ww2/b/316/2 (JU88 Page)
To search a particular item, example aircraft Type
Site:wp.scn.ru Spitfire (you can enter any make of aircraft)
This will give you a list of Countries that had at least one Spitfire
Kind regards
Ross