I'm a cancer information specialist and the book that I've used often in my library recommendations (and given to more than one friend with this diagnosis) is Be A Survivor:Your Guide to Breast Cancer Treatment, by Vladimir Lange, M.D. It's available on Amazon.com.
You can see excerpts from this book and other resources for breast cancer at this site:
http://patientresourcecenter.com. Just go to the Breast Cancer section of Cancer Sites and you can check it out.