Darkly Dreaming Dexter, by Jeff Lindsay

This is the first in the series of books that Showtime's television series "Dexter" is based on, and right now I really wish we had Showtime. I am a big fan of serial killer books, but this is maybe the first one that's told from the serial killer's perspective rather than a cop's or a victims. And Dexter is a curiously selective serial killer, one whose urges have been channeled, in a way. It did get a little over the top at times, but that's part of the fun of serial killer books, right?