Rating: 

Seems like a good book but this complaint is about Chapter 7 : Networking.

Issues :

1) Example code is missing.
2) Client side of "7.1.5. CFSocket Example: Joke Server" is missing. I expected sections here like 7.1.5.1 "JokeServer" and 7.1.5.2 "JokeClient."
3) It's not clear from the "JokeServer" example whether the server is meant to be another iPhone or a Mac. And in general it seems you'd want to focus more on the client side of the interaction anyway.
4) It seems like more common networking examples could be have been included, like posting data to a URL. (Perhaps I missed the section on this.)
5) No screen shots of a working example on the iPhone and server, which makes me wonder if it was never actually done by the author.