I’ll start out by giving the Major Time Sink Warning.
Basically it’s a list of links to an eclectic collection of online sites, either virtual museums, or online extensions of brick and mortar museums.
It ranges from the National Gallery of Art and the Metropolitan Museum of Art’s Timeline of Art History, to obscure and wonderfully bizarre collections like The Galleries of Thrift Store Art and the Museum of Vintage Octopus Pulp Covers.
Though there are plenty of art related links, the MoOM is not entirely art oriented, and you’ll find such gems as Very Small Objects, The Museum of Useful Things, The Virtual Typewriter Museum and the Squished Penny Museum.
The majority of the selections are art or design oriented, however; bearing in mind that’s a broad definition that includes things like The Museum of Bad Album Covers, The Museum of Forgotten Art Supplies, The Magazine Cover Archive, A Few Thousand Science Fiction Magazines, The Comic Book Cover Browser (which I’ve mentioned before), and the Museum of Imagined Contemporary Art.
There is a small, blog-like column on the left called “Now Showing”, in which half a dozen items are featured and described in more detail.
The MoOM is updated quarterly and you can sign up for a mailing list notification.
Remember, I did give you the Major Time Sink Warning.