Scheduled to launch in Fall 2012, BookMentors.org is a non-profit that intends to use "micro patronage" to supply teachers, students, and librarian in high-needs schools with books.
BookMentors.org is a place where you can give and receive books, as well as ideas. Teachers and librarians request, receive, and recommend books. Donors recommend and buy books for teachers. Students benefit from all the shared books and thoughts. Everyone gets to write tributes to their favorite children's and YA books.
Not only does this sound like a good cause but it also seems like another opportunity for children's and YA authors and publishers to promote books.
I've signed up for their mailing list to be kept informed about the upcoming launch.