When I first started I assumed that standing up was the way forward (quite literally) until I found myself gassing quite badly!. I now find myself quite firmloy in the longer/seated + shorter/standing school of thought, although I did stand up all the way up a long(ish) steep, climb on Sunday which I was quite impressed with (mind you that was partiallyto alleviate my sore hoop
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Have taken on one peie of advice I saw in Cycling Weekly the other week. Don't immediately drop to the lowest gear when you're finding it hard going on a hill, you end up using more effort simply spinning in a really low gear for the actual level of gain you acheive. Choose a slightly bigger gear and you'll find breathing easier. Apparently. Seems to work a bit better for me but then I am working from a very low base level!