Love this app! I just got my first book in the mail!
Here's what you do:
Download the app on your iPhone. Pay $2.99/month for shipping and handling. Choose up to 100 photos from your iPhone a month to make a small book. The photos are not super high quality but its nice to have a little book of your iPhone photos that you don't usually ever print/see again. Each picture is perforated so you can share photos easily.
Check it out!