BlogSkins now has a basic user rating system. Any logged-in user can rate any other registered user. Ratings are a simple positive or negative and require a comment. All ratings are public. Right now, each user gets a green flag if most of their ratings are positive, and a red flag if most of their ratings are negative. They get no flag if their ratings even out. This will change slightly in the future. Flags appear next to users' names in the skin comments sections and the forums. You can find the link to add/view user ratings on their profiles.

For now I'm simply tracking and displaying average user ratings. In the near future, I hope to use this information to give problem users "time outs", bans, delete their comments, highlight highly-rated users, etc.