You should go here and leave your comment, I will help you: http://bloggingsecret.blogspot.com/2007/04/triple-xchange-for-everyone.html
Reputaion basically indicates that your post has made the other person helpful. This is one way to say, "Yes, your thread was helpful to me and I recommend him to others.
or for making comments that make people laugh...like mitcharr here...just got a rep from me because that was a pretty good statement he made I've gotten all mine (not a whole lot yet...but halfway to my second 'pip'...just for making sarcastic comments it seems...lol...but i guess for the right reasons... and a few for being helpful
Well you need some good posts and helpful to others. If someone like your posts than he may add reps for you.