http://code.google.com/p/django-email-confirmation/

This simple app is for cases where you don't want to require an email  
address to signup on your website but you do still want to ask for an  
email address and be able to confirm it for use in optional parts of  
your website.

A user can have zero or more email addresses linked to them. The user  
does not have to provide an email address on signup but, if they do,  
they are emailed with a link they must click on to confirm that the  
email address is theirs. A confirmation email can be resent at any time.

As of r22, what's on the trunk should be usable but I welcome feedback  
on how to make it better. The source contains a working project that  
shows all the features of the app as well as providing useful code for  
your own project.

This code is based in part on django-registration and is essentially a  
replacement for it where your requirements are different.

James