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Well, now there's only one: http://mathoverflow.net/users/3133/engelbrekt
Hopefully he or she will sort out what's been going wrong with logging in; feel free to email the moderators about it.
I have a standard email that I send to people who end up with lots of unregistered accounts that explains the probable source of the problem (browser deleting cookies), the benefits of registering, and how to create an OpenID. I just sent a copy to engelbrekt.
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