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If its an aluminium stem in a steel frame, the heat method won't work. Aluminium expands faster than steel under heat, you will just get it more stuck.
My case was an aluminium stem in a steel frame. It expands faster, but then it also contracts faster, no? Anyway my LBS got it to work using this method, but I don't have the details.
Tijs-
Since the steel is on the outside and hit by the heat first, I think you can get away with it but you have to do it quickly. Unless you can keep the stem cool of course. If the steerer heats enough to expand before the heat has penetrated to stem then I guess it works. Tried it on a seatpost once but it was a no go.
PhilDAS
If its an aluminium stem in a steel frame, the heat method won't work. Aluminium expands faster than steel under heat, you will just get it more stuck.
Last option is to cut through the quill where its vertical so you just have a stump sticking out. You should then be able to remove your headset and take out the forks. Then you can take your time cutting out the stem without a frame hanging off it.