How rich art is; if one can only remember what one has seen, one is never without food for thought or truly lonely, never alone. -- Vincent to Theo, 1878
The Vincent van Gogh Gallery is the site for van Gogh online. It's endorsed by the van Gogh Museum (<brag> I've been there! </brag>) and features, well, everything: 2200 images and 874 letters, every surviving thing that Vincent ever painted, sketched or wrote. Chronological and subject matter indices, a canonical works gallery, commentary and analysis, biography, an online forum and more, available in thirteen languages on a clean, well designed site. Bravo, Mr Brooks.

The Art*o*mat is just plain cool. In 1997, Clark Whittington converted a recently-banned cigarette vending machine to sell his black&white photos for $1 each. Today, his company Artists in Cellophane operates 60 art vending machines in 18 states, featuring the work of over 300 artists from 10 different countries. I note that there are no artomats in Oregon yet; I wonder what it costs to sponsor one?
Way cool update: the artist whose pendant is shown here, Sandra Marchewa, showed up in comments. You can see more of her art here. While I'm updating, it appears there's now an Art*o*mat in Oregon, at Lane Community College -- but still none in Portland...