Yes, there's also that... has the glitch allowing a sock-puppets army been discovered / fixed?
Well, how would you prevent someone registering multiple accounts manually? Going by IP could unfairly stop multiple people using the same computer (e.g. me and my wife) or even multiple people behind the same proxy server (e.g. the same job, or the same university).
I think the correct approach to this is to admit that you simply cannot prevent someone from creating hundreds of accounts, and design a system in a way that doesn't allow an army of hundred zombies to do significant damage. One option would be to require something costly before allowing someon...
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