The email address as user id is becoming the preferred way in my
opinion.

Pros: 
an email address is unique; 
an email address is easy to remember;
in many cases the system requires the email address also for sending
messages.

Cons:
still not everyone has an email address;
an email address may change over time.

Did you consider OpenID?
http://openid.net/

- Yohan



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Posted from the new ixda.org
http://www.ixda.org/discuss?post=37879


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