Being a huge art history buff, I know that I'm going to incorporate as much art history as I can into my future classroom.
I stumbled upon a great art education blog called Art Is Messy (http://www.artismessy.org/) It's by the wife of the guy who does The Carrot Revolution blog!
Anywho, Art Is Messy lead me to this awesome site: Smarthistory (http://smarthistory.org/). In a nutshell, Smarthistory is an online art history textbook. Pick a work of art from a list of time periods, styles, artists, or themes, and you can hear a conversation about the piece by real art historians. The conversations are causal and understandable, and short enough to not lose the attention of students.
Here is an example of a conversation about Vincent Van Gogh's Self Portrait Dedicated to Paul Gauguin:
Showing students these conversations on Smarthistory would not only give them the chance to view historic works of art, but would teach them how to talk about a work of art like an art historian.