A Cabinet of Curiosities, a treasure trove of early microscope slides and apparatusLinks to other microscopy and related sites
Antique Microscopy – General Sites
A Cabinet of Curiosities, a treasure trove of early microscope slides and apparatus
Antiques of Science:
Microscopes, Microscope Slides and Other Antiques of Science
Antique Brass Microscopes, the Wissner Collection
AntiqueSlides.net, the Reiser Collection
Association de Sauvegarde et d'
Etude des Instruments Scientifiques et Techniques de l'
Enseignement (ASEISTE). Click on "Inventaires", then search for "microscope"
Blocker History of Medicine Collection, UTMB
Le Compendium, the Balasse Collection
Collecting Antique Microscopes, the Silva Collection
The Dittrick Medical History Center of Case Western Reserve University, (search for "microscope")
Harvard Museum of Science Search for "microscope"
The Kambeck Collection of Historical Instruments
The Kuhn Historic Instruments Collection
Micrographia, the Jones Collection
Microscope History, the Goren Collection
Mikroskop-Online Mikroskopmuseum
Museo Galileo, Institute and Museum of the History of Science (visit room 8 for microscopes)
Museo Microscopio, the Eliseo Carrascal microscope collection at the University of Salamanca
Museum Optischer Instrumente, the Mappes collection
National Museum of Scotland Microscope Collection
OldMicroscopes.com, the Maurizio Pizzigoni collection,
Scope Porn, the Silverman collection
University of Arizona College of Optical Sciences Collection
Virtual Museum of the History of Mineralogy
Whipple Museum (search for "microscope")
Historical and Related Microscopy Items for Sale
Antique Microscope Slides, buy and sell slides, microscopes, etc.
Antique Microscopes and Microscope Slides UK, buy and sell slides, microscopes, etc.
Arranged Microscope Slides, a blog by slide-maker Stefano Barone. Also visit his home page at http://www.stefanobarone.net/index.html
Fleaglass, antique microscopes and all sorts of other scientific intruments
General Microscopy Resources
The Amateur Diatomist, a long running resource on diatoms, including microscopy
Microscopy UK and Micscape, Exploring the Miniature World
Micrographia.com, A Light Microscopy Resource
Historical Photographic Resources,
including microphotography and photomicrography
Excellent resource of historical photography, including works by microphotographers.
Societies and Clubs
Manchester Microscopical and Natural History Society
Microscopical Society of Southern California
ARS Machina
Bononiaemicroscope
The Crovetto Collection
The Golub Collection
Histoire du Microscope
Historische microscopen
The Meeusen Collection
Microscopes of Simon Plossl
Molecular Expressions
The Micropolitan Museum. Excellent collection of information and images taken through the microscope. 
The London Stereoscopic Company. Named after the famous Victorian era company, this site is full of exciting information and pictures, largely focusing on steroscopy. 
The Magic Lantern Society. 
Leeds Microscopical Society
New York Microscopical Society
Postal Microscopical Society
Quekett Microscopical Club
Royal Microscopical Society