Hello there!
I'm the author of Hearts Over Fences, and just happened to get a Google Alert about this forum!
Horse Fiction is alive and well, and Hearts Over Fences is not out of print--in fact, it is my best-selling title on Amazon.
True, bookstores don't want to stock it because they consider horse fiction a too-small niche.
Another interesting thing is that I've also been considering starting a chapter blog of my first book. I followed your links to BarnMice to see how Unbridled is doing. Seems like a positive thing to do...any comments?