I'm currently involved in a project to provide an "open to everyone" free learning management system. I've take the Indy site and converted it into a free online course. It's has a short quiz at the end of it course and provides a printable certificate that teachers can use to validate that the students studied the course information and passed the exam.

http://www.learningzen.com/Study/CoursePreview.aspx?CourseID=150

Again, its open to anyone, and educators are welcome to post their own online courses in the same system.