Fotografica, Dutch Society of Photographica Collectors
Photographic Collectors' Club of Great Britain
The Kodakgirl collection, with all the Kodak girls you ever wanted to see.
Walker Mangum's Kodak collector's page. With many early Kodaks. Tip: have a look at the early catalogs.
The beautiful site of photographer and collector Pere Pons from Barcelona.
The site of Rob Niedermann with a variety of rarely seen wood cameras, related history and advertising.
Lots of instruction manuals (PDF) for all makes of cameras at the site of Mike Butkus.
Eastman Museum collections online.
Many fine antique cameras on the site of David Tristram Ludwig.
Austrian photo history, with a focus on equipment. Has also a list of photographers.