Here are some books I highly recommend.

Peopleware

Most development teams are unproductive because they're treated like crap. Including yours.

Extreme Programming Explained

A method of programming centered around, of all things, writing code.

Non-manipulative Selling

Why is ironing out the details of a mutually beneficial deal so painful? It turns out, there's no good reason. This book explains how to keep negotiations from getting hostile.

-Bram Cohen