There was a BMW forum I was on that had a great reputation system. Members would + or - your post based on helpfulness, accuracy, etc and you'd end up with a positive or negative rep (green or red rep points). Ultimately it would help users identify who were the qualified members and who were the post whores and tools. The system worked. I Just don't see the point of having a + rep option if you can't also have the option of a - rep. It may cause the doofus posters to think twice before whoring it up.
