PaperBackSwap
Swap, trade and exchange books with others for free. Mail a book. Get a book. Any book you request is yours to keep, share or trade. No late fees. No hidden charges. Every time you mail a book to another member, you can request one for yourself. The only cost to you is postage to mail a book to someone else.

Bookmooch
Many of the same features as PaperBackSwap. Members can also leave and receive comments and feedback from fellow "moochers".

Booktagger
A virtual bookshelf to help you keep up with what you have read. Need to recommend a book or read another person's recommendation? Booktagger.com is the place for you. Discover good books by browsing others' bookshelves, create book lists, and build (or join) an online book club.

Pettus High School Blog
Check out these great book trailers on current YA titles.