L.
Hi T.,
I know you didn't ask for books that are gender specific but a couple GREAT books on boys are "Raising Boys :Why Boys Are Different and How To Help Them Become Happy and Well-Balanced Men" and "Raising Cain - Protecting the Emotional Life of Boys". You can find both of these at the library.
It's also really insightful to read books on temperament like "Understanding Your Child's Temperament" especially if you have a second child who doesn't operate like your first! :)
Another great book is How to Talk So Kids Will Listen & Listen So Kids Will Talk.
I hope that helps!
L.