When you go to your UserCP, you will now be able to see your last 10 rep comments received, and your last 10 reps given.
Additionally, you now have the ability to edit the reps you have handed out. If you make a spelling error, you can go in and fix it. If you give positive or negative by mistake, you can edit it and reverse it. Just look all the way to the right of your rep comments given and you should see a link to edit if necessary.