Although the René Magritte exhibit at LACMA was not all that long ago (2006-2007), that can be a very long time as far as archiving of exhibits goes on the Web. To the gallery's credit, most of the "Related Links" at the bottom of the exhibit page are still active. I found the LA Times review after searching on Google, but it is painfully full of ads, most of them for Salvador Dali paintings for some reason, or for something even less relative, depending on when you look.
The Wikipedia entry for Magritte is quite good, with a good selection of images of his art, even if they are low-resolution. The external links for the entry are mostly useful, especially the one for Magritte at Artcyclopedia which has lots of links to art galleries with Magritte collections.
An excellent site is the Musée Magritte Museum in Brussels, which offers not always easy to follow trails to entries about the artist's background and pictures of his art. MoMA has eleven images of Magritte's art and descriptions of some of those. None of the sites I found, except for some linked through Artcyclopedia, had images that could be enlarged, which I think is a real shame - I want to examine his work in detail.
