It doesn’t show yet on the main Certain to Win page, but [FLASH! Update:  Now you see all editions when searching for Certain to Win]  there’s a Kindle page for it:

http://www.amazon.com/Certain-to-Win-ebook/dp/B003N9C0D0/ref=sr_1_3?ie=UTF8&m=AG56TWVU5XWC2&s=digital-text&qid=1274448496&sr=8-3

CTW is also available in eBook format for a variety of readers at Barnes & Noble and BooksOnBoard.