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I like the way StackExchange does this, actually. When a user is deleted, her posts remain and are attributed to her username, but her username only no longer appears as plain text (not a hyperlink), hyperlink anywhere it appears, and her profile can no longer be accessed (even if you know the URL).

I notice that for all the different statuses that Askbot has for user accounts, there is no "hidden" or "deleted" status.