I just received this book yesterday. (I have his maintenance book - between it and the Park Tools site - and sometimes Sheldon Brown - I feel pretty comfortable with minor repairs).
I was quite impressed with this. Even though I knew a lot of this info (having largely gleaned it from posters here), it is pretty well written. There are several chapters on "fit" and the different approaches to it and related formulas, lots on training (I particularly liked this section), good info on geometry, gearing, and also sections on skills such as counter-steering, etc. Most of the sections are split into a "road bike" and "mountain bike" part.
I'm curious what other people think of this book. I'm relatively new to road biking, but a lot of stuff I've read is pretty elementary or common sense. This was a bit deeper, IMO.