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@TheShipwright
safest thing I reckon is the hacksaw blade. Cut seatpost almost flush with the top of the seat tube and then start cutting down lengthways. Have the blade cut on the up stroke. Once you are near to cutting through the alu seatpost you can "feel it" change you need to keep checking every 20-30 secs. If you're careful, and it's easy to be careful (it just slows things down) you will not damage the seat tube.
Some people have had success with ammonia but it's not guaranteed.
Of course there's always
http://sheldonbrown.com/stuck-seatposts.html
I got one out recently by drilling a hole thtough the post about middway up the part that was sticking out. I then bolted a sturdy 8mm nut and bolt through it, clamped the BB shell in a vice and twisted the seatpost with a large 4 feet sash clamp. I didn't try to do it one twist but rather gradually twisting and pushing a little further every time. When it freed up it went with a real bang so much so that I thought I'd popped a joint on the frame.
I should say that this frame is cromo not some lightweight racing frame.