The Insider's Guide to Getting Your Book Published

I got a copy of this book last year because it was well reviewed and was obviously on a subject that I need help with! It's an easy read, well laid out, easy to jump in and out of and it's not at all pretentious or patronizing, which some of these books are. The author, Rachael Stock has worked for three major publishing houses and has had a lot of experience making decisions about what to publish and what to bin.

This is one of those books where nothing is a surprise but you are constantly surprised that you that haven't done the things that Stock is recommending, so therefore I would say that it's a big help. I found it especially helpful in regards to writing a query letter for an agent. Put it this way, the very first query letter I wrote, I received this rejection: "Not for me, thanks".
I then read 'The Insider's Guide to Getting Your Book Published', wrote a proper query letter and my second rejection was fantastic. Really! You can check it out here.