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@weazlepopper
I just had a really stuck stem in a 60s bike that i found in the street.
I suggest: Get a big ass steel rod with a diameter about half or less of the seat tube (the kind of thing they have at the side of roadworks sometimes. Drill a hole through the side of the seat tube, insert rod and use as a giant lever. Clamp the BB in a vice or between your legs and try to get the pivot point to be exactly central to the seatpost so you minimise twisting the frame.
Before doing this squirt GT85 down the crack at the top, also take out BB and squirt on inside of seat tube (while holding frame upside down and allow to penetrate) to try and soak oil on the other side of the seat post (might make more progress).
You could also drill a hole in your bb big enough to push a rod through and catch the edge of the seat post bottom to whack out with a mallet. Maybe as a last resort.
Maybe this too: http://www.physicsforums.com/archive/index.php/t-105538.html