FYI, Microsoft Press ebooks, which are also sold through O'Reilly, qualify for this deal too. For whatever reason, they are not listed on the parent link though.

http://microsoftpress.oreilly.com/

I've heard (many times) that Code Complete is very good-- I'm strongly considering purchasing it.

Oh - in that case, Charles Petzold's 'Code' is in my opinion a genuine masterpiece. It's a hard-to-place book in many ways. It explains what computers 'are' from the ground up, in a way that's accurate, fun to read if you're even passingly interested, and fairly complete.

A fascinating book for both those who know nothing about computers, and so well written it's still a great read for those who know them inside out. If not for yourself, it's possibly a great gift for a family member who wonders what exactly it is that you 'do'.

http://oreilly.com/catalog/9780735611313/

It also works for Land of Lisp! 24.95 -> $9.98

It's been mentioned here a lot of times during the last few weeks.

Time Management for System Administrators By Thomas A. Limoncelli

http://oreilly.com/catalog/9780596007836/

Beautiful Data (http://oreilly.com/catalog/9780596157111/) sounds interesting.

I'm considering The Book of PF, Second Edition.