What's he using to pull out the articles? I had a hacky version set up using the Readability algorithm but never bothered to make it public.
Boilerpipe is by far the best tool for this that I've ever found ( http://code.google.com/p/boilerpipe/ ). I'd be interested to hear if he is using something better, but I'd be surprised if he is. I think this is a great idea and very similar to a lot of stuff I have worked on recently. It's cool to see so much interest in these text-related services.
btw I know that at Techmeme, Gabe spent years perfecting his story parsing for the 50k+ sites he tracks. Even something that would seem simple such as parsing the date of a story from a webpage has a ridiculous number of permutations that you have to grep for.