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"Bulletproof" won't do it for me, as I don't use XHTML, and don't believe it's day will ever come. HTML 4.01 strict for me.
HTML & XHTML The Definitive Guide (Fifth Edition)
Cascading Style Sheets The Definitive Guide (2nd Edition)
Eric Myers on CSS, More Eric Myers on CSS.
CSS HTML Utopia: Designing Without Tables Using CSS
What should I update? What is obsolete? What new books have come out which are now essential?
I know my CSS books are old, and were written in the middle of the initial CSS frenzy. I suspect some greater clarity has been brought to the subject since then.