The Uglies is about a society of genetically perfect people. When they reacha certain age they get a surgury making them beautiful. The ones under the age limit are called Uglies. The sequel is called Pretties, then comes Perfects the newest is called Extras.
The Midnighters is about a group of kids who have an extra hour at midnight. Everything freezes except for them. They fight demons and things like that.
I love Scott Westerfeld, I would recommend his books to anyone.