Tyler Cowen turned me on to this ebook by the blogger Tim Kane, called The Guarden, apparently "a bedtime story that got out of hand." Since it was only $3, I picked it up and blasted through it in a couple hours. It's a gripping and surprisingly deep look at the future in a adolescent novel wrapper. Once you get your teeth in (for me, about paragraph six), it's a fun read. (Don't worry, it's nothing like Twilight, as proved by the fact that I got to the end. I literally couldn't read three pages of Twilight without tasting bile.) Check out here for a free 3-chapter sample.
I'm a big fan of books like this: a definite pop feel, with a hard-charging story, some reasonable characterization, but really cool ideas lurking underneath everything. Not so philosophical that it gets weighty or pretentious, though. If you've got an e-reader, I recommend it highly.