Biographies on Germans from World War II

Aces of the Luftwaffe: Detailed biographical information about aces of the Luftwaffe
American Aces of WWII: Biographical information and scores of US aces of World War II, as well as information about the most famous US aircrafts. Also includes a section on German aces and World War I aces
das-ritterkreuz.de: Large database of Ritterkreuz (Knights Cross) recipients
Die Sturmartillerie: Information in German about the German assault guns, assault gun brigades and crews of World War II
panzerace.net - SS-Hauptsturmführer Michael Wittmann: A very extensive online biography about Michael Wittmann, in both English and German. It covers both the civilian and military aspect of Wittmann's life, with some great side information
Panzerheld: Biographical information on Ernst Barkmann
The Adolf Hitler Historical Archives: Biographical data about Hitler, along with documents, transscripts of speeches, online version of Mein Kampf and much more
The Generals of WWII: Very large database, with information about many (probably most) of the Generals of World War II, covering both the major nations and the minor nations very extensively