Unwind by Neal Shusterman. Lord, I hated this book. Not only does it remind me of Never Let Me Go by Kazuo Ishiguro, which I hated, but I just finished The Leftovers by Tom Perrotta, which also reminds me of Survivor by Chuck Palahniuk (aka Fight Club's author).
I'm over this genre. Which genre, you might ask? I don't even know what to call it. It's sci fi, with cold characters, religious cults, and general bullshit.
Edited to add: I just realized how nicely the recent controversy regarding denying transplants to children with developmental delays fits in with these books. Why make up this shit when the real shit is just as bad?
1 month ago