Peopleware: Productive Projects and Teams by Tom DeMarco and Timothy Lister is the one book you MUST read if you are in any kind of professional, knowledge worker business. Although it is written for the software companies, in fact it is packed with insight that applies to any business where people work with their brains.
It talks about the kind of working environment you need to ensure maximum individual productivity (two person private offices, big desks, lots of shelves etc.) and to maximise concentration (stop paging people over the PA) and to ensure maximum team productivity. As the name suggests, the authors think that people are the critical ingredient for project success. It's also a short book - about 220 pages.
Other related books that I highly recommend: The Mythical Man Month and Other Essays on Software Engineering(summed up by an old colleague of mine as "it doesn't matter how many times you have sex, it still takes nine months to produce a baby") and Rapid Development: Taming Wild Software Schedules (a bit of an epic but biblical in authority as well as length) and Frederick Herzberg's classic: One more time: how do you motivate employees? (clue: more money won't do it).