Paintings in Museums and Public Art Galleries:
Hermitage Museum, Saint Petersburg, Russia The Martyrdom of St Peter
Kress Foundation Collection NEW! (Look for the "Image" links for super high resolution scans) A Soldier
Louvre Museum Database, Paris Concert
Louvre Museum Graphic Art Database, Paris (in French) NEW! 
Courtauld Institute of Art, London, UK Madonna and Child
Pinacoteca Nazionale di Bologna (in Italian)  Abramo e Melchisedech
State Museums of Florence Digital Archive, Italy Portrait of a Man (thought to be a self-portrait), miniature
State Museums of Florence Digital Archive, Italy Portrait of a Man, miniature
Pictures from Image Archives:
Lionello Spada in the Art Renewal Center
Lionello Spada in the Web Gallery of Art 
World Visit Guide (formerly Insecula)
Bildindex der Kunst und Architektur (in German)  (a welcome screen is displayed for a couple of seconds before the search results appear)
California State University WorldImages Database  Crucifixion of Peter
Ciudad de la Pintura (in Spanish) 
State Hermitage Museum Unofficial Site NEW!
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
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