iPhoto 6 now allows you to create a slideshow of a Photo Book. Before you could only watch a slideshow of single, full screen photos but now you can do this will the pages of your photo book. iPhoto has always allowed you to export a normal slideshow to a Quicktime movie, but this option doesn't appear to be available for photo book slideshows. However there's a secret way of doing this.

Start by creating your photo book. Do this by clicking on the new book button at the bottom of the window and giving your book a name. Notice that it now appears in the sidebar. To add photos to the book, browse your library and drag the photos you want to the photo book entry in the sidebar. When you have added all you want, click on the photo book. You can now enter the title and description and any other information about your photos. Place them in the book by dragging them from the toolbar at the top into the photo frames in the book. If necessary, add extra pages by clicking the corresponding button at the bottom of the window.

Once your book is completed, you can view the slideshow by clicking the play button at the bottom. This will bring up the slideshow options. Make sure the random order check box is unchecked (you don't want your pages appearing in a random order) and choose the amount of time you want each page to appear for. To make the movie more book-like you will probably want to use the "page peel" transition, going left. You might also want to add some background music from your iTunes library.

Now if you click play, the slideshow will begin full screen. Check it appears exactly how you want it. Now how do we get this into a movie you can save? Exit the slideshow to return to your photo book. Now hold the Option key and click the play button again. You will get the same slideshow settings as before. Check they are all right and click play.

Instead of going to the slideshow, you will now be prompted to choose a location to save your movie. Give it a name and click export. Now your photo book is saved as a Quicktime movie that you can watch and share.