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Are we talking about an aluminum seat post in a steel frame? The problem with applying heat in that situation is that the aluminum expands faster than steel-- which would seem to make the problem worse, not better.
The one time I had this problem I spent a few days soaking it with penetrating oil, trying to get the oil to flow down between the seat post and the frame.
Then I wrapped the exposed portion of the seat post in dry ice. Basically, I crushed the dry ice, put it in a ziplock bag and wrapped it to the seat post. After 10 minutes or so the seat post was nice and cold and I was able to break it loose with big ass wrench.
YMMV
Again, I think this method works best with aluminum seat posts and steel frames, given their relative coefficients of thermal expansion.
Jared
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