Museums Resources Maintained by World Wide Art Resources
Guide to Museums and Cultural Resources on the Web A comprehensive listing maintained by Jim Angus of NHM of Los Angeles
Looking at Older Prints -- a section of the Printroom site maintained at the University of Kansas.
Introduction to Imaging: Issues in Constructing an Image Databaseby Howard Besser and Jennifer Trant. A recently-issued, well-regarded brief introduction to fundamentals.