Thomas, the one concern I have is that there is a way for the community (and not just one person) to make this "decision." So if I really don't like someone I can gave them -40, which is about my bank now I think, and it will appear to others that they are a really bad user, but they may just rub me the wrong way. But if I think someone is being a pain, other people should agree with me before they get some form of "punishment." The community should decide (or a group of the community larger than 1 person).

I do think we need something like this, just need to figure out how to make more community involvement in it.