Just uniformology, right? Here's a list of sites that I've used. I tried to keep it to sites devoted to uniformology, though many of them have other info that is equally interesting and useful, too:
Dragoner-Regt. 2, the website of an Austrian re-enactor group:
http://www.kavallerie.at/
Lots of info, including uniforms, tracing the regiment from the Seven Years War up to the Great War
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Hessen-Militär, the website of the Society for Hessian Military and Civilian History:
http://www.xn--hessen-militr-mfb.de/
Lots of info, including uniforms
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Prussian Military History:
http://www.grosser-generalstab.de/
Most of the images are by Knötel, in the form of the various tobacco card series available in the Thirties. There are also associated pages for the Imperial-and-Royal Army.
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Seven Years’ War wiki at Kronoskaf.com:
http://www.kronoskaf.com/syw/index.php?title=Main_Page
Lots of good info; it was here that I learned more definitive details about the Brunswick regimental flags, for example, putting to rest the uncertainty on the subject perpetuated in Schirmer’s book and carried forward by Pengel & Hurt. The site’s content is constantly growing.
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Nec Pluribus Impar, on the French army from about 1700 up through the Seven Years’ War, and also the other combattants:
http://vial.jean.free.fr/new_npi/
Some very good articles and illustrations on a wide number of regiments, including unit histories, flags, smaller uniform details. However, the editor has scaled back updating the site. It used to be bi-monthly, but now, it’s updated less frequently. Still, the archives are very useful.
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Militärhistorisches Museum der Bundeswehr:
http://www.militaerhistorisches-museum.bundeswehr.de/portal/a/mhm
The online home of the Bundeswehr’s Museum of Military History
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Bayerisches Armeemuseum:
http://www.armeemuseum.de/
The online home of the great Bavarian Army Museum
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Historischer Bilderdienst, (“Historical Image Service”):
http://www.historischer-bilderdienst.de/index.php
This site offers reproductions of many of the various printed collections of uniform history that were in print in the late 19th and early 20th centuries.
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Fredericus-Rex:
http://www.fredericus-rex.de/
Conrad Schulte’s online shop (I helped translate one of the pages
) Conny carries CD collections of printed uniformology, and also has some images available free.
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HZ-Forum:
http://www.hz-forum.eu/forum/index.php
Since I listed his shop, I’ll list Conny’s forum as well. Right now, we’re rebuilding after taking a major hit in a hacker attack just before Christmas, so much of the content is gone, and is slowly being re-posted. But it’s worth having a look and joining, even if you don’t speak German.
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The Anne S. K. Brown Military Collection, Brown University:
http://dl.lib.brown.edu/libweb/collections/askb/index.php
Another site worth browsing, and if you can take a trip up to the school, well worth the trip.
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New York Public Library’s digital gallery:
http://digitalgallery.nypl.org/nypldigital/
A lot of material is up online at the NYPL’s site; that’s just a starting point link
And of course, some of the other modeling/miniature/painting sites can be useful, because people are always posting research that they've done"
Hope you find those as useful as I do.