Peopleware/ProductiveProjectsAndTeamsSecondEditionBuy it. Read it. Get it stolen by your boss. Buy another!
This is the definitive book on developer treatment and effects of good & bad treatment. Good news: it's showing up in Project Management required reading. The grad students debated it the whole class. I loved it!
--BobLee July, 2002
Also reviewed Peopleware/ProductiveProjectsAndTeams.