Some great ideas, Marc! Thanks!
I like the idea of the teacher setting the certificate option. That works for my purposes better than grades. I was thinking of adding it to the grades page the teacher sees. A nice check box or something perhaps. Then for the student add a "print certificate" link on their grades page that would display the PDF image that they could print or save. That would require them to access the course one more time after they have completed everything. Hmmm - maybe emailing would be better.
I should be able to get the basic module written by next week. I will post and see what y'all think!
Jenny