I just started Kyle Pruett's book, Fatherneed, and I've found it quite wonderful. It's not just that he focuses singlemindedly on dads -- that's a nice aspect, but not one exclusive to him -- but rather that he spends the time to nail down the science. Heck, he's the one that's done most of the science. And I'm not left with the frustration I feel at seeing pages and pages devoted to anecdotes. Someone cares enough to study -- and that's always a pleasure.