If you know of a site that you think is a good historical reference, feel free to submit it. Again, it must be relevant to the WWII period. Please avoid personal and "dedication" sites unless they offer some genuine historical insight, info or photos. I do not want a page that's a mile long, cluttered with piddly sites paying homage to someone's dog, on free servers that assault people with dozens of pop-ups. If the site is really good, I'll let some annoying ads slide, but it really aggravates me as well as many others.

Museums

Battleship Cove: Fall River, MA
Bovington: England's armor museum.
Collings Foundation: Air and armor. Stow, MA.
Eldred WWII Museum: Eldred, PA.
Fagen Fighters Museum: Aircraft, vehicles, interactive displays. Granite Falls, MN.
MAPS Air Museum: Military aircraft museum in northeast Ohio.
Mid-Atlantic Air Museum: Reading, PA. Also hosts WWII Weekend in June.
National WWII Museum: The big one. New Orleans, LA.
Panzer Museum: Munster, Germany.
Patton Museum: US Armor museum at Ft. Knox, Ky.
8th Air Force Museum: Savannah, Ga.
Texas Military Forces Museum: St. Austin, TX.
WASP Museum: Dedicated to the women of the Air Corps in WWII, Sweetwater, TX.
William C. Lee Airborne Museum: Dunn NC.

General WWII

Center for Military History: US Army site with numerous books and documents available for purchase or download.
Chronicle of Terror: Thousands of interviews with civilians (mostly Poles) who lived through the War.
European Center for Military History: Letters, diaries, interviews with veterans, photos and such.
From D-day to VE-day: Tour service for ETO battlefields.
Ft. Worth QM Depot: A collection of photos hosted by the University of Texas.
Military History Online: Book reviews and articles on battles and campaigns. Good stuff.
Miltary Trader: Publications for Reenacting, MV's, and collecting.
Pegasus Archive: Excellent site with extensive information on the Battle of Arnhem.
Tank Encyclopedia: Cool site for armor nuts.
WWII Casualites: National Archives database of US military dead and missing, organized by state and name..
WWII Letters: Actual letters written by troops and their families.

U.S.
503rd PIR Website: Site dedicated to the paratroopers in the Pacific.
Army Quartermaster Foundation: Some interesting tidbits regarding WWII supply.
B17 Flying Fortress, the Queen of the Skies: Cool website with databases of individual aircraft, crash locations, news, production details and more.
Blitzkrieg Baby: Website dealing with women in the US military during the War.
Coupons and Rationing in WWII: Interesting page about the American coupon system and rationing during the War.
Combat Chronicles of US Army Divisions in WWII: Great guide as to what each division did and its component units.
Extracts From History: Great info site for US WWII Reenactors.
Gear Illustration: Handy site referencing field gear of all sorts and eras.
GI Concepts: Consulting company with many excellent reference photos of uniforms and equipment. (One needs to use the search bar to locate them.)
Missing Marines: Site dedicated to Marines and Sailors still missing from WWII.

Rangers: Articles on the history of US Army Rangers from the official Army Special Operations Forces history site.
Sherman Minutia Website: Lots of great photos and details about M4 Sherman, M3 Lee and Grant tanks.
The M-1 Helmet: Useful site about US helmets.
US Military Uniforms of WWII: Excellent (though incomplete) index of US uniforms with details of War Department specifications.
US Army Data Depot: Excellent reference site with lots of original data.
USMC Collectors: Site from France with photos and reference info on WWII USMC uniforms and gear.
Vietnam Gear: Not WWII, but I like the utility of the website.
WW2 Airborne: The best overview of all US WWII airborne units. Unit histories, subunits, TO & E's, honor rolls, and links.
WWII US Medical Research Center: Site with tons of information on US medics, field hospitals and so forth.
What's in your Seabag? Interesting page covering the contents that were to be in sailor's seabags.

German
Aktion Rheinhard Camps: Detailed histories of the death camps. Belzec, Sobibor, Majdenek, Treblinka, labor camps, ghettos etc.
Axis History Factbook: Complete directory of all German and axis military units in WWII. Covers all branches of each nation's armed forces.
Feldgrau.com: General WWII German military history site.
German WWII Helmets: Nice reference site for Stahlhelm enthusiasts.
German WWII Ammunition Labels: Lone sentry's article on how to translate the labels on ammo boxes and crates.
G43/G41/MP44 Page: Great infor and pics of original slings, mags, pouches & guns.
RG34 Blog: Site dedicated to the German rg34 cleaning kits.
SS Belt Buckle Archive: Page showing several dozen SS EM and Officer belt buckles.
Surviving Panzers: Site listing surviving WWII armor.
The Warsaw Uprising: Site about the battle for Warsaw.
Uboat.net: The best U-Boat site with histories of every German submarine. Search by boat number, losses, shipyard built, wolf pack etc, etc. One of the more volumous and informative sites I've ever seen.
U-869: Site dedicated to the boat and men of "U-who", found off New Jersey n 1991.
Wehrmachts Kitsen: French site on all manner of German crates and ammo cans.
WWII German Sniper: Very nice site detailing the various types of sniper rifles used by Germany in WWII.

Waffenamt & Maker Codes
Eagle Relics: WA codes by number.
Maker Codes: Lists of German WWII maker codes and their meaning.
Waffenamt Codes: Claus Espenholt's page. (pdf)
Waffenamt Codes: Proofhouse