Museums and Public Art Galleries:
Giovanni Santi at the National Gallery, London, UK The Virgin and Child, slightly better reproduction from the picture library
Giovanni Santi at the National Gallery, London, UK The Virgin and Child
Courtauld Institute of Art, London, UK Tomb of the wife of Pietro Tiranni, fresco
Professional Tools:
Artprice
Pictures from Image Archives:
Aiwaz Panopticon NEW! 9 paintings online
Bildindex der Kunst und Architektur (in German) 
Ciudad de la Pintura (in Spanish)  Saint Jerome Enthroned
Articles:
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
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