I've never seen any "official" guidelines, but in my group we handed out 1-2 poker chips to each player. Throughout the round, they could give those chips to any player that had an instance of exceptional role playing. At the end of the round players could hand in their chips (only those received from other players, not those given to them at the start of play) for rewards. Those rewards could include experience, loot, or even ability score increase or a new power.

I've never seen any "official" guidelines, but in my group we handed out 1-2 poker chips to each player. Throughout the session, they could give those chips to any player that had an instance of exceptional role playing. At the end of the session players could hand in their chips (only those received from other players, not those given to them at the start of play) for rewards. Those rewards could include experience, loot, or even ability score increase or a new power.