I recently downloaded the Kindle for iPhone app and have been obsessed with ebooks ever since!
Unfortunately I just downloaded this to check it out and my advice would be not to bother. It's extremely basic and quite short with no information on the different packages or locations, barely any photos and definitely wouldn't tell anybody who regularly uses this forum anything they didn't already know (well I'd be very surprised if it did anyway)
Definitely no competition whatsoever for Carrie's book!
But I guess it IS free so there's nothing to lose (except your time) downloading it...