[Zope] user id naming conventions

[Joshua Lanza]

Does anyone have any feelings on the best way to manage user id's?
Specifically, I am trying to decide how to create user id's for CMF. I
don't want users to have to create a user id themselves - seems like one
more thing they have to keep track of and could deter people from using
the site. Instead, I wanted to use email address as the id - it's unique
and easy to remember. The problem, of course, is the '@' and '.' in
email addresses. I could encode both chars at every point that user id
is used - a hassle, but possible. The ZODB allows '@' in the id. Any
thoughts?