#iPadOnly is a new book written by Augsto Pinaud and Michael Sliwinski.  While the book is interesting based on the topic alone, I find the distribution even more intriguing.

1. Nook
2. Kindle
3. Paperback
4. iBooks
5. iBooks for iPad
iBooks for iPad means it's an iBooks Author book and contains interactive content.  This is Apple's leg up on Amazon.  An iBook and Kindle book are largely the same.  This means you buy on price and platform.  iBooks Author means exclusive to iPad.  Is this a coming trend and what can Amazon do about it?
#iPadOnly website via Brett Terpstra