Seven Years of Highly Defective People

This is more than just a collection of Dilbert comic strips. Instead the book chronicles the development of the strip over its fist seven years, showing how the various characters were introduced and developed over time. Each character or storyline featured has a section of strips that Scott Adams has annotated with comments about where various ideas came from and what reader reaction was. This is much more fun than just reading the comic and features tons of strips from when Dilbert was freshest.