We've actually been letting people vote for as many entries as they'd like for the last few months to see how that works. As far as judging... that's ultimately up to you as a voter. We provide guidelines and 'rules' for each particular challenge, but not everyone's esthetic is the same, and voting comes down in the end to a mix of what you like and how closely you think the entry sticks to the original brief. But again, that's your call.