I've always tried to make a point of phoning or emailing - a boss if possible - to say 'thank you' when somebody does something special; provides a special service or goes "above and beyond".
In these days of consumer power and litigation, companies and organisations are so braced for complaints it can really be a bit of a shock if somebody just calls to say 'well done'.
Anyway... I've just been on the receiving end.
Out of the blue, a phone call from the Wendy Wu of Wendy Wu Tours - an Australian specialist tour operator to China that has just recently opened an office in London - to say she has just had a customer who found them through my listing on Travel-Lists and 'thank you very much'.
That's cheered up the afternoon!