I prefer books myself. It's pretty hard to get a good start on a complex topic online. One of the few good online tutorials I've come across recently is Why The Lucky Stiff's bizarrely-illustrated Poignant Guide to Ruby. But, even so, ultimately, I bought all the Ruby books. :) And the thing is - the Poignant Guide is actually a book - just an online book. I printed it out.
I'd be interested in recommendations on current advanced/comprehensive HTML and CSS books. That's an area I haven't updated in a while.
"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 What is obsolete?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.