Linux in a Nutshell by Ellen Siever et al.

Runner-up: Just for Fun: The Story of an Accidental Revolutionary by Linus Torvalds and David Diamond

Linux in a Nutshell from O'Reilly remains your favorite book again this year. In fact, it took twice as many votes as the number two favorite, Just for Fun. We mentioned Just for Fun in last year's Readers' Choice awards, and apparently many of you took the hint and bought it.