Why not do both. I've always preferred letting the database generate an auto primary key (id in django) even if my usage is primarily a different column for key. Storing an int isn't wasting much space, what do you have to lose? I've got a users object for example that requires a unique email address as username. That column is declared unique and indexed. I use the id internally, and the email address for logins, etc. I assume an integer index is a little faster, but mainly I do it because it doesn't rely on user data that may for some unknown reason change.
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