There's a new system for peer-reviewing edit suggestion which allows sub-2k rep users to edit posts as long as two 1k+ users (or one 20k+ user) approve the edit. Of course the overall goal of all parties involved is to just make the site better, but I propose to add some incentives for the users involved.
The user making the suggestions already gets a rep bonus if it's approved; I propose to also add some sort of reward to the user(s) approving the edit. Not necessarily reputation, this could be something as simple as a new badge or two:
Reviewer - voted on 50 edits
Scrutineer - voted on 500 edits
Notice that it's important the reward will be per vote and not for just approving edits - i.e. consider both approving and rejecting edits, since what we want to reward is users reviewing these edits.