[Phanx]

I'm not sure how much cookies or localstorage will really help... if someone wants to re-vote, they can just clear their browser's local data. I guess it will probably stop most casual re-voters who just forgot they already voted.

Anyway, I generally don't find simple rating systems like that very helpful, especially if they're only one way. If I'm visiting a site that's 1 year old, a good macro that's 1 year old will have a much higher rating than an amazing macro that's 1 month old, and that makes the rating information completely useless. A system like Amazon's would be better, where each vote is from 1-5, and the total rating is the average of all votes, with the total number of votes displayed next to the average rating.