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This has actually been proposed by many members over the years. And I've told them the same thing I'm about to tell you: it's a good idea, I'd like to do something similar to it, but it'd be a little difficult, logistically, and it'd probably hurt a few feelings.
It'd probably only work if the categories were highly specific. Things like "Best Poster" would end up including votes for people who are the most informative, easiest to get along with, most active, etc. Better to make each of those factors their own category.
So, if there's a strong consensus in favor of this, and we avoid overly broad categories, I suppose we could give it a shot. We'd definitely need standards, though (IE: a set number of days during which each poll will be open), and I'd suggest that the "Make votes public" option NOT be checked, to at least cut down on any mild animosity that might result.