Erich Hartmann - Top Ace of All Time: Biography of the highest scoring ace of the war.
Fallschirmjäger 1936-1945: Airborne operations and ground campaigns involving German paratroops during WW2, including veterans accounts.
Luftwaffe Resource Center: Resource that cover all aspects of the German Air Force.
Messerschmitt BF109: Technical data of the versions, images, and aces.