Probably many of you already know about this website by Khan Academy dedicated to the history of art... I have discovered it today and I found it very interesting!
You can select the period, the style, the artist, or choose a theme (more general subject). For most of the subject you can find: video, link to Flickr images and in-depth analysis.
So, go to http://smarthistory.khanacademy.org/ and enjoy your journey through art!