Peter Siebel's Coders at Work. Very funny and insightful.
Predictably Irrational, The Hidden Forces That Shape Our Decisions, by Dan Ariely.
Interface Oriented Design, by Ken Pugh.
Collaboration, by Morten Hansen, because Bob Sutton recommends it.
These are in no particular order.
Tribes by Seth Godin. Great book. On loan to Shirley Oya.
Kevin L. Meyer and William Waddel's Evolving Excellence: Thoughts on Lean Enterprise Leadership.
Scott Berkun's Making Things Happen: Mastering Project Management. I also owned and sold his previous book: the Art of project Managment.
Eric S. Raymond's The Art of UNIX Programming.
Kevin Klein's SQL in a Nutshell, Second Edition.
Alex Martelli's Python in a Nutshell, Second Edition.
Alex Martelli and David Ascher's Python Cookbook.
Geoffrey A. Moore's Dealing with Darwin (how great companies innovate at every phase of their evolution).
Mark Summerfield's Programming in Python 3.
Joe Celko's Analytics & OLAP in SQL and Joe Celko's SQL Programming Style.
Eric Sink's Eric Sink on the Business of Software.
David Flanagan's JavaScript: The Definitive Guide.
Steve Holzner's PHP: The Complete Reference. Covers PHP 5.2.
Leon Atkinson and Zeev Suraski's Core PHP programming. Covers PHP 5.
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The shrewd reader will note that the links to books contain Amazon.com affiliate links. I use these enormous sums to purchase more books from Amazon.com. Imagine that.