Most shops that resurface rotors will only do the conventional turning regardless whether they are sloted, drill, or not.
The Flywheel type surfacing that Todd is speaking about is call Blanchard Grinding. That puts an non-directional finish on the flywheels or brake rotors. I always get my rotors blanchard ground because the non-directional finish to the rotors helps bed the brake pads better. However it does not require any special brake lathes to do the blanchard grinding on brake rotors. They will usually use a 4-5" hand grinder with about a 180 grit wheel and they will move the grinder in a small circle while the lathe is spinning the rotor(after the rotor has been turned).
Many shops like AutoZone or Pep-Boys will look at you with a blank stare if you as for you rotors to be blanchard ground. Usually you have to go to good auto-repair shop, or machine shop. We do have an independant autopart store in town with a machine shop in the back and they do my brake rotors for about $18 now. They used to be as cheap as $10, but over the years their prices have gone up like everything else.
If you have a flywheel resurfacing/repair shop, they can probably do the rotors too, and they know exactly what blanchard-grinding is because it's done on vurtually every flywheel.
...Rich