Every Friday I take the initiative to search through thew newly free titles on Amazon, and to identify those that might be of interest to trans* readers, fans, and lovers. Even if you don't have a Kindle, you can still download the titles through one of Amazon's free reading applications, and covert it (if need be) with Calibre. I can tell you I do most of my reading on my iPad, using Kindle for iPad, and it works beautifully.
Please do be sure to check the price before downloading anything, though, as most freebies are limited time offers, and some are specific to certain regions.
The Games (Part Fourteen) - A Tale of Forced Feminization (The Manhood Game Series)
Cuckolding a Total Sissy (Dicey Affairs)
The End of Billy Knight Part 1: Runaways
Friday Night Players: Big Fish
Discovering My Identity: Five Fictional Stories of FTMs
James Also Known as Janie: A Transgender Short Story
Trans* 101:: Exploring Gender Identity (Trans* Education Series)