Dan:
Do you mean print it yourself or have Apple do it? Apple is not setup to reprint old pdf files. One way you can print it your self is:
Open the pdf, start the print process and in the Print window, select Send PDF to iPhoto under the PDF menu. This will create a 2200 x 1700 pixel jpg file for each of the pages and import them into iPhoto.
This allows you to manage and work with each page separately. It's also a great way to make a DVD slideshow of a book to go along with the book if it's a gift.
Do you Twango?
TIP:
For insurance against the iPhoto database corruption that many users have experienced I recommend making a backup copy of the Library6.iPhoto database file and keep it current. If problems crop up where iPhoto suddenly can't see any photos or thinks there are no photos in the library, replacing the working Library6.iPhoto file with the backup will often get the library back. By keeping it current I mean backup after each import and/or any serious editing or work on books, slideshows, calendars, cards, etc. That insures that if a problem pops up and you do need to replace the database file, you'll retain all those efforts. It doesn't take long to make the backup and it's good insurance.
I've written an Automator workflow application (requires Tiger), iPhoto dB File Backup, that will copy the selected Library6.iPhoto file from your iPhoto Library folder to the Pictures folder, replacing any previous version of it. You can download it at Toad's Cellar. Be sure to read the Read Me pdf file.