Remzi gets bashful hearing this kind of praise, but I'll pile on. He's had a profound effect on me in the classroom and as a mentor. A lot of you probably use techniques Andrea and Remzi were directly involved in advancing -- MapReduce, in-FS checksumming, etc etc.

This book was already the the core of the intro OS class when I took it several years ago; it's only gotten better and more complete since then.