Kahn Academy - saw a story on this on 60 Minutes this week. The site is FREE and has thousands of tutorial videos and practice lessons for nearly every subject. Teachers (and homeschool parents) can track their students' progress. Go at your own pace. Did I say it was FREE???
Claude Monet, Poplars, 1891. Video: http://smarthistory.khanacademy.org/monet-poplars.html . Also, "Monet in Zola & Proust: How did Zola and Proust depict Monet?" by Jeffrey Meyers. (Subscribe: http://www.newcriterion.com/articles.cfm/Monet-in-Zola---Proust-1411)