I think use the email address as the user id is a better way.
pros:
people often forget their different ids for different websites,but no
one forgets his or her email address;
sometimes,people can not use some ids they want because somebody has
registered them before;
email addresses are often used to keep the ids safe;
 cons:
some people don't like too many emails with their id information
sent by different websites;
some people don't check their emails frequently.

All the best! 

Angela





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


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