Hehe
A rep (reputation) system was used on VMKF a while back, but was later taken off (then put back again, and is now off yet another time).
With the rep. system, there was a button on posts that you click on to give either good rep (for good posts, good points, good attitudes, or whatever else), or bad rep (for innapropriate posts, rude posts) to the user who created the post/thread. If you went into User CP, you could see how many rep "points" you had. There were also colored square-type things on a user's post that let everyone know what their rep. status was.
Hope that helped
~Pink