Paintings in Museums and Public Art Galleries:
Kress Foundation Collection NEW! (Look for the "Image" links for super high resolution scans) Double Portrait of a Boy and Girl of the Attavanti Family, ca.1580-85
Sofonisba Anguissola at the Prado Museum, Madrid Felipe II, ca.1564
Allen Art Museum at Oberlin College, Ohio Double Portrait of a Boy and Girl of the Attavanti Family
Milwaukee Art Museum, Wisconsin Portrait of the Artist's Sister Minerva
Museo Nazionali di Capodimonte, Naples, Italy (in Italian) NEW! 
Museo Poldi Pezzoli, Milan, Italy Self-Portrait
Poznan National Museum, Poznan, Poland NEW!
Southampton City Art Gallery, England
State Museums of Florence Digital Archive, Italy
National Art Databases and Museum Inventories:
Danish Museums Online (in Danish)  (You can switch to English by going to the very top of the site, but the viewable works are much fewer)
UK National Inventory of Continental European Paintings (NICE) NEW!
Pictures from Image Archives:
Sofonisba Anguissola in the Art Renewal Center
Artcyclopedia Masterscan feature: Self-portrait at an Easel
Sofonisba Anguissola in the Web Gallery of Art 
Wikimedia Commons Image Database 
Bildindex der Kunst und Architektur (in German)  (a welcome screen is displayed for a couple of seconds before the search results appear)
Ciudad de la Pintura (in Spanish) 
MyStudios
Miscellaneous Sites:
Artarchiv Sample Artist Signatures Scroll down to signature 14
Women Artists from the Medieval Period to the Present
Articles and Reference Sites:
Grove Dictionary of Art Online (excerpt) 
Union List of Artist Names (Getty Museum)  Reference sheet with basic information about the artist and pointers to other references.
Wikipedia, the "Open Content" Encyclopedia
Oxford Dictionary of Art (eNotes) NEW! 
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