Who was Michael L. Printz and why is there a young adult award in his name? For answers, I turned to the American Library Associations website and found this answer along with a comprehensive list of winners and honor books.
From the ALA Website:
The Michael L. Printz Award is an award for a book that exemplifies literary excellence in young adult literature. It is named for a Topeka, Kansas school librarian who was a long-time active member of the Young Adult Library Services Association. The award is sponsored by Booklist, a publication of the American Library Association.*
* accessed May 1, 2009 at 11:39pm EST