I got the 2nd Edition of the O'Reilly DHTML book in the mail the other day and after a few days of reading, I must say this is by far the best book I've ever owned. Most people know of my love affair with the first edition, and while I thought a 2nd edition would be better, I didn't think it would be as good as it is.

First of all it's thick. 1400 pages. 1400 pages full of syntax references, quirks, tips, tricks, cross references, coding practices, etc. I don't even think they should call it a DHTML book. That's just to limiting. It's more like "every single thing you can do in a browser".