Certify is a new module for awarding and generating PDF certificates to students based on a set of criterias. Currently supports quizzes from the quiz module and book pages from the book module.
The module require Quiz v4+, Book and pdftk installed on the web server.
It does not have a release yet (it's still rough around the edges and not recommended for production), but has working code in CVS. So feel free to try it out, file issues or submit patches. :)