ICT SLB has nailed it, and hopefully I never get to try any of the posted methods.
Once the aircraft is depressurized we would transfer to our own oxygen supply contained within the parachute pack and exit the aircraft in an orderly fashion! Standard issue USAF helmets and O2 masks are also the norm for this type of flight. The parachute also contains an automatic opening device in the event that we're not able to open it ourselves.
On our next aircraft we're also going to be using a "firemans pole" type of exit through the floor - I believe that the Shuttle is also equipped with something similar.