It's ages since I've covered a fine arts site and I've never reviewed one for a specific artist. But this site that I came across in Karen Schneider's excellent LIIWeek (www.lii.org) was tempting. And you can tell what I do when tempted.
Take the tour and you'll get his biography and some of his paintings, fact sheets on the included paintings and various other bits of information about his work. There’s even a film of the man himself at work!
Annoyingly, tours like this often don't give you any idea of how long they are or how far you are into the site once you've started. But this is always a problem with hypertext. Still, there are ways around it and I hope they implement one soon.
The Monet site is just part of the Boston Museum of Fine Arts site at http://www.mfa.org/home.htm and that holds lots more goodies, including some 500 items from their permanent collection.