The month of July is pretty much the best month of 2012 to find Free eBooks for Young Adults (and any other eBooks, including books under the Coming of Age genre). That's because Smashwords is holding their annual Summer / Winter sale (the winter part is for our friends 'down under').
Many authors have joined this sale, so there is a great selection and it's a great opportunity to fill up your reading device. Smashwords' eBooks are available in all formats, for Kindle, Nook, Kobo, Android app for Tab or smartphone; it's all available for almost every book on Smashwords. But, this is a limited time offer, and it ends on July 31st, and it ends on July 31st, so don't delay.
And one more thing... on Smashwords, there's no worry about region, or country, or location when you get these books for free. Unlike Amazon, or Apple, or most of the others, you 'purchase' these free Smashwords books anywhere.
On this site, regular weekly listings of free eBooks for Young Adults will resume in August, after this sale. For now, enjoy your summer (or winter), and happy reading!