Exceptional author, lots of great trilogies and more; all aimed at teens and very modern/edgy and usually involving a social issue in more than one way. Lots more to add, but check out: Uglies, Pretties, Specials and now Extras (for those fans, it's out in October) along with Peeps, The Last Days and the AMAZING, FANTASTIC supernatural Midnighters trilogy. Oh, and So Yesterday is great with a male protagonist in the world of trends and such (even though he's straight).
He doesn't write with too much description and isn't too sparse or trying to be a born again kid as an adult... he uses a ton of humor and relevant cliches (accent on the e) and while otherwise I'd type up a long homage to his books, you should really check them out yourself!
He's not anti-gay at all, but there's hardly any GLBT mention in any of the books, what there is isn't mean or anything but I'd say he is a very relevant, very good teen fiction writer. At this point, a lot of his books are also out in paperback so don't be deterred by hardback purchases or anything.
Oh http://scottwesterfeld.com/author/books.htm has some of his personal comments on his books, critic reviews and book descriptions.
Go read him!