There's always something interesting posted over there. Recently they started posting challenges. The current one is balloon doodles, which I think is great.
This one is a bit more than just random doodles, but some of the work featured is amazing. I really enjoy the artist interviews. I read Katherine Dunn's recently (her work above), and not only do I think her work is great, but I want to live on a farm in Oregon just like her!
I'm also thinking about participating in this: