This is in reference to the Moodle module for Drupal 4.7.4 . Basically, if you configure Moodle to authenticate users from an external database, and that database is the Drupal database, you can seamlessly invoke Moodle in an iframe with automatic login from Drupal.
I made some quick modifications to get this module working for Drupal 5.0 beta. This is a tarball of the module actually working.
I find that relative URL's for the (possibly local) moodle installation do not work, and require a full http://… URL.
I have attached the file to this entry. AS IS, folks, no guarantees; and I am hosting it as a temporary measure until better Drupal/Moodle integration is possible.