David Pogue's Mac OS, The Missing Manual: Tiger Edition, is an interesting, enjoyable, and useful read. At 845 pages, it might not cover everything one needs to know about the latest Mac OS, but it filled in the gaps for this new Mac user. One might have done through this book with computer on lap. I did not. I read it a bit at a time, and dog-eared pages that I thought were of special interest. Then I went back, with computer on lap, trying the things he suggested.
I like Pogue's style and the book, more than a manual, held my interest. Buy it, enjoy it. You can get it from O'Reilly, but if you order from Amazon, below, I get a few cents.