The Portable MBA by Robert F. Bruner (Author), Mark R. Eaker (Author), R. Edward Freeman (Author), Robert E. Spekman (Author), Elizabeth Olmsted Teisberg (Author), S. Venkataraman (Author)
A good resource for a DeveloperTurnedManager or for other techies who suddenly find themselves going to lots of meetings with people wearing suits. It doesn't go into a lot of depth but it will at least help you to understand the language and concerns of business-school grads.