I just picked it up as well this evening. Brian's description is right on--a fine book for someone who knows how to make a basic print and wants to do the next thing.
One thing I particularly liked was that most of the prints are accompanied by a straight image of the negative. It's hard enough to learn what a good print looks like, but I think it's even harder to learn what a good negative should look like, and Les has included variations on certain images that show both good and problematic negatives from the same scene. Les is also working mostly with rollfilm, so one doesn't have to get the sense of "I'm not shooting large format, so I don't really have any control," that most of us have had at one time or another (at least until we started shooting large format! Maybe you have to do large format to realize what you can do with rollfilm).
Les was also kind enough to send along with his contribution for the Traveling Portfolio a print of "Door, Bodie," which appears on the "Contents" page (in a different crop from the print), and I can verify that the reproduction quality is pretty good.