I'm curious to find out about this as well since I just uploaded a manuscript, sans the pics from it, to test the viability of it. I knew that the work wasn't going to get published elsewhere since I've already broken it up into pieces as articles, so it was the right choice for me to use as a tester. I read on one blog (can't remember where now) where they were selling well on the kindle platform. But that was a "random person" on a "random blog" and I'd much rather see if people here are seeing any sales on the kindle.