for starters : ask your upper level residents.
Most are by word of mouth.....usually interdepartmentally so you are covered by your programs malpractice umprella
upper levels. fellows, etc will know the straight dope on scoring lots of extra cash
moonlighting out of the framework of your program : you'll need your license. just be careful!
and then of course with the little 80 hr work rule.......well I see that cutting into people's moonlighting $$. Glad we didn't have that when I was a resident and fellow ) whoa, that makes me sound old, which I am absolutely not )