Discovering the Mystery of Faith: Experience by Glenn Packiam is a multimedia exploration of exactly what it says in the title, free courtesy of Christian publisher David C. Cook.
Currently free @
iTunes (available to Canadians).
Since this is a "Made for iBooks" thing, this is unlikely to show up in the other stores, and might perhaps remain free for quite a while as a format demo like the other one I'm going to post.
It's also a 200+ meg book containing audio and video, so you may want to download to your computer and sideload if your iDevice's wireless method involves bandwidth charges.
Description
Because the way we worship shapes the way we believe, we need to take a hard look at what we sing, pray, and do when we gather as the people of God.
Created with Apple's unique iBooks Author, this book includes videos, music, and stunning artwork that will inspire you to embrace the mystery of faith.