My blog with booklists, top tens, top books of the year (tested nationally), book reviews and author programs:
Library Services for Youth in Custody - for collection development lists, etc.
American Library Association book awards (some may or may not be appropriate for your facility and that the youth may or may not actually read, but they are the books that have won awards). http://www.ala.org/alsc/awardsgrants/bookmedia
and Young Adult Library Services Association (YALSA) awards ( same caveat as above): http://www.ala.org/yalsa/bookawards/booklists/members