Check out Mark Harden's Artchive .
Browse his extensive collection of master paintings by painting movement or by individual artist - read bios of each artist, and with great high-res scans, virtually put your nose right up to a painting (okay...your screen) without risking a single museum cop yelling at you.
A must have link if you're doing old master copies.
There are also links to current online exhibits, and analysis, theory and criticisms of famous works. It's difficult to find out much about Mark himself, except that he writes for an online art magazine called Glyphs.
And, I just love the pun in the site's name. :)
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