4) Tell me there's a character limit, and what that limit is :)
New feature: Why not combine the scoring with Flickr like tags. Instead of just being limited to increasing/decreasing an items karma, give me the option of increasing/decreasing tags, and the ability to add a new tags of my own which others could then vote on. This would probably be a good feature for Reddit as well. They could do away with the handful of subreddits they have and use this tagging scheme instead.
>>rmack0+(OP)
I think this is a great idea. It would let things like slashdot's "funny" and "insightful" happen organically. I've been toying with doing something similar for a political blog for a while.