Despite my near addiction to PBS channels, I have somehow managed to miss most episodes of their great series, Art:21 Art in the 21st Century. The good news, I just found out, is that the entire series is available through Netflix. You can even watch episodes instantly on your computer screen. (They also have Simon Schama's excellent series, The Power of Art, another fav.)
If you go for Episode 1, you'll get to hear photographer Sally Mann make this fantastic statement about art: If it doesn't have ambiguity, don't bother.