donker wrote:

...You would then have to use 'underwater' usernames (i.e. usernames that will never be visible to anyone). The extra steps to be taken are
1. Automatically generate usernames during user creation
2. Check on email submission and change that this is unique !!
3. Change the login procedure to map the given email address to a username

Did I overlook anything?

It seems from this thread that a number of people have followed these steps. Has anyone put up a sample to share or a more detailed description?