I've worked on a version of the user registration that includes
an email confirmation step. The form doesn't change, but on submit
a confirmation email is sent.
Following the link sent via email triggers actual user creation.
Tests are welcome:
http://www.osgeo.org/cgi-bin/ldap_create_user_emailconfirm.py?mantra=
NOTE: you need to append the mantra value there
--strk;