I finally got to read Release It!. It would have served me better had I read it 10 years or so ago when I actually bought it. But never too late. There is a second edition that came out this month. While this first edition clearly shows its age and relics of another time, I guess the second edition is more hip, fresh, readable and with more experience to share.
Not a timeless book, but one that needs a refresh every decade or so. I tag it under “system administration” too, because a system is what you build, works and bring money in, not just what Ops runs and grumbles about.