Sarah Dessen's books are awesome. Dreamland is a great book. It's the book i read by Sarah Dessen and got me addicted to her books.
Anyways, Speak by Laurie Halse Anderson is a great book. Even though it's somewhat more similar to Sarah Dessen's Just Listen. It's about this girl, Melinda, being pretty much an outcast at her school, after she calls the cops at an end of the summer party where she got raped. It's a great book and i totally enjoyed reading it.
Another great book by Laurie Halse Anderson is her newest book, Prom. It's about this girl, Ashley, who really doesn't give a crap about Prom, but ends up having to organize the prom after her friend (who is on the prom committee) gets injured. Her boyfriend who she planned on moving in with ended up being a jerk when she needed him. It's a great book and worth reading.
Another great book is Sloppy Firsts by Megan McCafferty. Or Gingerbread by Rachel Cohn, and also the sequels to that book, Shrimp and Cupcake. They're all really great books and totally worth reading. :)