Iain Vellacott is a very talented British painter living in France. He has started a beautiful website devoted to Joaquín Sorolla, an artist whose list of present-day admirers keeps growing. Sorolla Paintings is well worth bookmarking, and check out Iain's killer work on his blog, Painting Inoils.
I have referenced the John Singer Sargent Virtual Gallery many times, a wonderful resource put together by Natasha Wallace. Warning: it's very easy to spend a lot of time there!
Thanks to the creators of these sites, both my favorite painters!