Especially for those of us who collect such things, the University of Michigan Museum of Art (UMMA) provides a nice example of a university art museum website. In the Collection Galleries section, wander from gallery to gallery and browse selected items from the permanent collection. For example, the Marvin H. and Mary M. Davidson Gallery, European and American Art 1650–1830, is represented by a Rembrandt self-portrait from 1638; see Picasso's "Two Girls Reading (Deux Enfants Lisant)," 1934 in the Modern Art Foyer. The collections search is integrated with the MLibrary interface to all University of Michigan image collections, so searches can be quickly broadened beyond UMMA holdings. There's short, brochure-style information about past (back to 2001), current, and upcoming exhibitions - a Laurie Anderson installation goes on view April 6th. About the only downside is no online shopping in the museum store.