US tanks of World War II

AFV Database: Extensive database of US armour, from World War I to present
Encyclopedia of the Tanks of World War II: Interesting articles and comparison of the tanks of the major countries of World War II
European Center of Military History: Very extensive photo archive, with a lot of exellent photographs, primarily of Allied soldiers and materiel
Jagdtiger: Photographs of museum World War II armoured vehicles from around the world
OnWar.com - Military History Research: Tanks of all major nations of World War II, maps of the battlefronts and a timeline of World War II, as well as several articles. Also includes information on modern-day AFVs and military history in general.
panzerfantasy and panzertaktik: Information in German about the armoured forces of Germany, Russia, USA, Great Britain and France
Panzerlexikon.de: Excellent portal for information on the tanks of World War II
Tanks in World War 2: Information about tanks from all the major combattants of World War II