On her blog, Malinda Lo posted a list of 10 books by transgender authors about transgender characters, all of which were YA friendly. I'm familiar with a few of the titles - isn't Kate Bornstein considered a must-read these days for trans stories? - but I'm excited about several new to me options, like the Kicked Out collection and Nevada by Imogen Binnie. Those are in my shopping cart right now.
Go check it out. If you haven't read any trans work, I challenge you to try it. Every voice deserves to be heard.