Our surgeon-blogger at A Chance to Cut is a Chance to Cure gives us his take:

Are you currently board certified? . . .
How many of (Insert procedure here) have you done? How many have you done in the past year? Month? . . .
What provisions are made for complications at the surgery center? . . .
If I have a question or a problem at night or on the weekend who will be there to assist me? . . .
If having a laparoscopic procedure: How often do you have to convert to an open procedure? How many of the open procedures have you done? . . .

Read his article for full details. (A Chance to Cut is a Chance to Cure, Jul.16)