Danny's got a great post on his Daggle.com blog, it deals with measuring Google News traffic vs. Digg traffic. He also goes into giving some great information on "the long tail". The article is a bit lengthy, but it's definitely worth the time it takes to read it. There's a reason we all consider Danny "the search guy", and this article just backs that sentiment up.
Thanks for taking the time to give us this case study Danny!