Sentiment Analysis at the Huffington Post

I stumbled onto Stephen Baker's blog, The Numerati, and found a fascinating article on the anaylsis methods of The Huffington Post.  Of particular interest to me was how they're putting sentiment analysis into action, by analyzing the comments made on their site, and using that data to adjust the featured stories.  Wouldn't you just love to take a field trip into their offices and see how it's all being put together?