Reputation has been enabled for everyone. If you feel someone has made a useful post, give them reputation. For now, being in our early stage with no real forums yet, you should NOT be giving out reputation. Reputation will be used in order to rank up on clraik, which brings me to announcing...
Obviously the higher rank you have will give more benefits to the forum. These benefits will be updated in the official topic for ranks, as well as made an announcement for when there is an update.
If you have are good with graphics and are able to make us some rank images, post your samples here.