Just a thought, not sure how it would affect bandwidth but it would be neat to create a user, called "PF Monthly Photo Contest" or something like that. Then setup an album for each month's images. Using individual album names sort by date so the current contest can appear first in the list for the ContestUserID.
I would still leave the images in the voting thread but I was just thinking it might be and a nice way to compare images as we pare down the shots we want to vote for. Right now it's as tedious as it is fun and I think using the new albums might make it easier to vote...plus it is a nice way for people to find out how the albums work as well. So you kill two-birds-with-one-stone, resulting of course in two-stoned-birds...
Hope this reads OK...past my bedtime and well, the night doses are kicking in...