Here's how it would work - you basically get rep points according to "likes" or thumbs-up on posts. And to balance it out a thumbs-down would subtract from your "reputation". This sort of system would perhaps encourage more quality posting. We already have a recognition purely on numbers of posts but that's not sensitive to reputation just numbers.
Next to the user name or avatar you could have a graphic showing the reputation in terms of a power bar or colour code with the number.
Comment is invited.