I've just begun reading Sarah Dessen's books (That Summer, Someone Like You, This Lullaby, The Truth About Forever, etc.), and they're amazing! They all have great messages in the end and I really like her characters (especially in The Truth About Forever). I'd have to say my favorites of the books I've read of her's so far would probably be a tie of The Truth About Forever and Just Listen. I'm pretty much addicted to anything that she writes. I can't stop reading her books!