While a public voting record may work for members of congress, I can't see how that would help. If anything else, I would be strongly discouraged from voting on any submission if it might result in my being judged because of it.
I never really thought about people getting judged based on the submissions they've voted for - are you concerned about people coming back with "Mark_B, you voted up that posting by Arrington, so I think you're a talentless hack" or something like that?
Would you still have the same trepidation if the data were generally anonymized? I don't think there's a way to say that it would ever be actually anonymous, but it would prevent casual browsing of someone's voting history that way.
