I'll add one here from my own business, which is customer care outsourcing. The outbound call. Basically it comes with the territory when things go wrong. But when you call the customer before they realize things have gone wrong they are always, always grateful and impressed. Same thing goes for a "just checking in to see you are enjoying the service" call. Since we have agents sitting around all the time anyway this is time that can be used to call up customers and impress them.