Perhaps it would be interesting to add some more information to the registration process:
- Some environment stuff like:
OS version, PHP version, DB driver and version.
- Some Moodle stuff like:
Moodle Network enabled y/n (and number of "friend servers"), number of data and glossary (module) items, blogs...
Hub information, if the site is running as so.
All plugins installed (with versions). Admins could opt: All/Only core/None
Edited: 2012-01-13 to add the hub & plugins with versions.