Looks like the folks over at Google have done something incredible - The Art Project - which gives the viewer a walk through great museums of the world, among them the Met, The Rijksmuseum, the Uffizi Gallery, the Hermitage, MoMA, The Tate - it's quite an impressive list.
You can view the works themselves, or go on a virtual tour, which is pretty nifty for someplace like The Frick, which was a house as well. Or you can view the masterpiece St. Francis in the Desert as a singular piece.
Wow. I don't know what it means, or how it will affect people viewing art, but the access to the images is quite astounding.