Export a book as a QuickTime movie in iPhoto 6

Another undocumented iPhoto feature:

macosxhints.com - Export a book as a QuickTime movie in iPhoto 6

...Create a book in iPhoto. With the book selected, Option-click on the Play button. The slideshow settings panel appears as it normally would. The difference, however, is that when you click the Play button in the panel, you're prompted to save the slideshow as a movie. Pick a save location, name the movie, click Export, then wait. No need to invoke iDVD...