The digital collection of The Fine Arts Museums of San Francisco combines the collection of The Legion of Honor and The de Young museums into one digital archive. The database is home to over 85,000 objects. What I like most about this archive is the ability to zoom in very close to all of the pieces. The resolution for all of the digital pictures is of very high quality, making it easy to see the detailed brush strokes, artist signatures, and even object damage. This is simply a great site, home to two of San Francisco's wonderful museums of fine art.
http://search.famsf.org:8080/search.shtml?keywords=