S.L.
I've heard good things about "Be Prepared: A Practical Handbook for New Dads" it's practical and pretty funny. For the labor side of things, I always, always recommend "Ina May's Guide to Childbirth" by Ina May Gaskin for men, women, everyone. It has THE best and most interesting information about labor. It's such an eye opener. "The Birth Partner" by Penny Simkin is also good for preparing for labor.