Ben,
I've just realised...
I'm a little confused- are you after a specific book/info just for binocular observing or are you after a book on Astronomy in general (which includes a telescope)?
My original post was more specific towards telescope viewing (in the list of recommendations).
What Daniel said below with the suggestions of those two books are brilliant for binocular observing.
Robert Bee's book "Heaven's Above" is a fantastic book to start with (I've read it). You can buy it
here direct from the author. It's only $19.95 including postage. Bintel also sell it.
I haven't read Phil Harrington's book, "Touring the Universe with Binoculars", but I hear from many sources it's a great book. I think I'll get it myself one day as I love bino observing.
The Stars & Planets book goes much deeper (more specific for a telescope).
Please still read thru the link that I've supplied you with in my previous post as it covers both binocular and telescope observing. Also, regardless of what equipment you use, at the end of the day you will find it beneficial to learn your way around the sky which is covered in those links as well.