David Letterman’s birthday is today. We wrote a couple of earlier posts with some thoughts about this influential show biz figure (here and here), so today, I thought I’d plug Jason Zinoman’s must-read new book Letterman: The Last Giant of Late Night. We much enjoyed his earlier book Shock Value (reviewed it here) as do we particularly relish his comedy coverage for the New York Times. The marriage of author and subject promises to be nothing but fortunate in this case, and we can’t wait to sink our teeth into it. It was released yesterday.