I would love to see a complete "how to" session on self-registering for the web, as there's no easy to find documentation (though I'm sure it exists somewhere) and the entire process mystifies me.
Things I need to know and would like to see:
1. Setting up an additional address book to handle the registrations
2. Adding a self-register module to a custom application (and how to handle if user forgets password)
3. Adding the login box to a custom application
4. Licensing considerations for a self-registered application
Basically the way that OpenNTF.org and Ideajam.net handles all their registered users. Maybe someone could do a case study?