You can get a feel for the artist, his work with the short but detailed write-ups along with samples of their work, available at the Biography website. And you dont have to restrict yourself to the Impressionists or even artists for that matter. Wonderful addition to my growing list of sites.
Update: April 30, 2006 - BBC's arts website has put together a gallery of the most popular paintings by the leading Impressionists - Monet, Renoir, Degas, Gauguin, Seurat and Van Gogh. These will go very well with the write-up on these very same artists at the Biography website above.