Dr. Georg Damm emailed me this link to a Moodle plugin that has some
Sage support, but I haven't had time to really check it out (I still
don't actually use Moodle for teaching, and our university hosted
version is not hackable by me so its harder to experiment).
http://moodle.org/mod/data/view.php?d=13&rid=1725&filter=1
I encourage others to check it out though, hopefully I can get more
involved in this effort at some point.
-Marshall Hampton