I just received this information from a publicist at Henry Holt Books (a publisher of books for children and teens):
Henry Holt Books For Young Readers is starting a reviewing group for teens. All a teen (14 and up only) has to do is go to our myspace or website, get a parent/guardian to sign a form and then send it to Jennifer Abbots. We’ll send said teen free books. Not a ton, because HHBYR doesn’t put out a lot of teen books, but at least four or five a year. We ask that the teen write us a review, which we then post on our website—so in return for free books, the In Group-ers become blog-famous.
Please remember that you are not allowed to access myspace from the computers in the children’s department, due to our computer policy.