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I think what you're seeing is AOL in action. AOL users get a new IP address just about every time they load a web page. Makes blocking vandals from there a bit tricky.
That could explain it, the repeated behaviors could be users that know what they have and want to remain anonymous. I don't recall AOL advertising an anonymizing proxy feature? 8-)
Do you know if it is just dial-up users going through AOL, or do broadband and DSL customers who add AOL on and use the AOL browser, end up going through the anonymizing proxy too?
-- Silverback