[Spartacus]

Geek megaportalSlashDotwas among the first to use this, a way of allowing the community to moderate itself. Registered users can vote every post up or down, and each user winds up with a karma "score" that is just the sum total of all the "up" votes minus the "down" ones they've ever gotten.
We use this in the Cracked forums (where each member's karma score is visible to other members at all times). You can only vote once per day, so even a coordinated karma voting campaign couldn't change a score faster than the rest of the community could correct it.
Yes, it works. Everyone claims they don't care what their karma is, yet any time a person sees an unexplained drop, I get an email complaining about it. You just can't ignore a number right next to your name that announces what the community thinks of you.


Read more:http://www.cracked.com/article_16765_5-ways-to-stop-trolls-from-killing-internet.html#ixzz2PMbiLxw8

Figure 1 +1 to Karma



Figure 2 Karma Displayed Below Username

tldr;
> unhappy with someone's comments? "neg"/-1 his karma
> Good constructive? "rep"/+1 karma
> Karma displayed below user profile
> community self-regulates posts
> moderators still around to take control if/when necessary

What do you guys think? Are our forums suitable for this?