I re-pinned mine last fall.
if there is still any pin sticking out above the pedal platform hit it with the vice grips. saves alot of hassle with the drill if at all possible
reverse drill each pin and then ez out the remaining pins. sometimes you get lucky while your drilling and the little bastards come right out.
you will be able to ez out some of the pins that you drill, but not all of them, for the ones that get all bunged up and stuck you will have to drill oversize and thread in bigger pins.
I can't remember the exact size of grub that i tapped up to but i think i nabbed some pins from a set of axiom road gap pedals and if look at the pedals you don't even notice that the pins are bigger in some holes.
two more tips:
file the tops of all of the broken pins level with the pedal platform and CAREFULLY center punch the pin before drilling. It will exponentially increase your success rate.
I haven't personally checked it out but a very reputable source has told me that Canadian Tire usually has an excellent selection of very small hex-head grub screws (see where i'm going with this?)
if not you can order replacement pins through any shop with the big fat Norco catalogue