The Bible (I read it for comical reasons, it's so bloody ridiculous).
The little prince (translated the title. It's really a child's book, but it's brilliant).
Then I don't read a lot of pure fiction. It's mostly put in partially with chess, bridge, or something else. Frankly, I find fact based books more interesting.
I've read Harry Potter, The Golden Compass, Eragon (series) and alikes, but they didn't really hit me as that great. (The Bible on the other hand! - That's class comedy!)
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS







