Google Image search is a quick and easy way to find an art image you need for a class discussion or powerpoint presentation. However, a fantastic new painting encyclopedia, Wikipaintings may change the way you search for images.
Still in its early stages of development, the non-profit Wikipaintings already contains over 60,000 painting images. Browse paintings by art movement, technique, genre, artist nationality, or keyword. My favorite feature is the timeline scrollbar that places each painting created by the artist in chronological order.
I still love Google Art Project for the amazing depth and detail, but Wikipaintings is much better for understanding and visualizing the growth of an artist through his or her lifetime. I look forward to seeing how Wikipaintings grows once it is open to contributors; maybe it will even expand beyond 2-D work into sculpture and installation art.