registration

Anonymous Registration
If you want users to be able to create an account on your site you can use anonymous registration. Beware however that your site will not become an open messageboard to be used by spammers.
Karma, Using
In WebGUI Karma can be used to track and promote the activity of your users. Users can earn (or lose) Karma points with several activities. Karma gives a global overview of which users are logging in, and how much they contribute to your site.
user agreement upon registration
In the case you want to have users "agree" to some user or faith statement, there are two creative ways of accomplishing such task. These were offered as suggestions from IRC, feel free to add your own creative ways.