If you click the scale on the top right of the post for that person, you can rate their post. If you like how the person handled the post or question, you can do so. It is there so other people can understand how your reputation is on replying and making new threads.
I started to register as HT2, but heck, I knew I couldn't keep up with Tim. Talk about cutting a guy back down to Earth. How many posts does he have now? Let's see it's been running since sometime between when I left to appraise property and now, that oughtta give him about 200 posts.