For those of us in the unfortunate parts of the world that cannot order the gorgeous iPhoto books, we can still print those books on our own printers, or make them into equally gorgeous PDF's for sharing. It's easy to do, just choose "Print" in the 'Book' mode (not the preview view in Book mode, though), then hit the "Preview" button in the print dialog, and "Save as PDF" in Preview.
[Editor's note: It's actually even easier than this if you don't want to see the preview of the PDF file first. Just select "Output Options" from the print dialog box, click on "Save as File" and then select PDF as the file format.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020116041243820