Jeff Jarvis quotes the New York Post speculation that in the wake of the YouTube deal Gawker Media is worth $400 million, CraigsList $250 million, and Digg.com $200 million. He dismisses the valuation of Gawker as over-optimistic compared to the others. And he takes a poke at the NYPost; he was going to link to the original page but the Flash made his browser crash. I had a go at finding the piece, but gave up in the wake of so much tabloid online…