Here's the situation:
You are a big swingin' D at the office; lots of direct reports, you have the CEO's ear on things that matter. You hold many peoples' livelihoods and professional fates in your hands. And yet, you're surprisingly tolerable. People even wish you well. Now you and the wife are having a baby. One well-wisher wants to give you a gift. He works for you.
What gift would:
a) you find useful, thoughtful, and appropriate
b) impress you with his insight and gift-giving acumen
c) raise his stock in your eyes [NOT that that's the point, you understand, I was just asking...]
Especially early on in the pregnancy, we found little things like newborn onesies--maybe a nice one, or a little pack--that actually helped make the "baby" aspect more tangible than the "nausea and getting fat" aspects were very much appreciated.
If you're going the book route, I'd steer clear of the big handbooks--they'll have plenty of those already. I'd go with either a clearcut dadbook, like Be Prepared [if he's at all got a sense of humor] or a much giftier book like Crib Notes. If design is important, there's the useful AND goodlooking Baby Owner's Manual, too. Maybe because I don't like referencing sperm at the office, I'd steer clear of that other dad guidebook, My Boys Can Swim!