Fiction by John Green.
I've read several "teen" books by John Green recently (including An Abundance of Katherines) and they are all good. This guy is really good at getting inside his characters' heads, and taking the reader with him.
This story is about a boy in his last weeks of his senior year, and an adventure he has with the crazy beautiful girl next door. It is super-cool from a teen perspective, and super-scary from a mom perspective. And I'm old enough to have both perspectives at once.