http://www.amazon.com/dp/B00H3X7LJK (first one)
http://www.amazon.com/dp/B00HPAWYFW (second one)
I came across these on Amazon while trying out my new Kindle. They were a lot better than I thought! The writing is good, and the author knows horses. The first one is listed as free for Sunday, Jan 19th.
They’re Young Adult / Fantasy horse stories… talking horses in an alternate world, and a lost human from Earth. Actually quite entertaining if you like that sort of horse book.