Website: Art 21

I've written about the tv show Art 21 previously, but thought it was worth mentioning again as they recently launched their own website, Art21.org. Before they had a sub-site within PBS' monolithic website, now they've got an independent page with more resources. It's incredibly simple to navigate with four main sections. You can look through content by artist, browse through the numerous videos and educational resources. 

Season 5 is coming out 2012!

My favorite thing about the website is all the videos you can watch (there's over 100 as of this writing!). Some of them are just clips from episodes, but there's a lot of original content that never saw airtime on tv.
The educational section has many resources I think you'll find helpful, especially a glossary of art terms. There's also accompanying educators' guides to give background information on the artists and art spotlighted in the show. It takes very little time to browse around and find information as they've laid it out so nicely.

I recommend Art 21 in general for older teens, as there can be mature themes discussed. Some artists like to be shocking and disgusting simply because they can. Personally, I don't find any artistic merit or educational value in a piece of work titled "Captain Ballsack." It's not edifying or enlightening to me. I suggest just skipping artists like that. Most of the artist interviews that I've watched are entertaining and educational with little objectionable content. Art 21 has helped me learn how to talk about art in an educated and understandable way. I've learned there is no one "right way" to discuss art; what matters is engaging the mind and asking questions and seeking answers.

Art 21 also has blog full of depth and insight, though I find the language tends to be fairly scholarly and the discussions pretty academic in nature. The posts tend to not be very understandable to the reader who isn't well versed in art history.