I use one based on the APA/PBA but i am not sure how happy they would be if i pasted it up...
Bascially you should consider all aspects of the business including marketing and client retention and intellectual property. Set the ground rules so it is clear.
With my receptionists, I try not to have a hard and fast list of what their duties are otherwise they will just point to the list and say "that's not on the list therefore i am not doing it" (I have one receptionist like that!) So try to keep the points as general (yet specific :lol ) as possible...
It is a good idea for a post though! Keep up the good work physiobase!