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There is an interesting article HERE which is very applicable to discussions on internet fora such as this one.
If you can't be bothered reading the article here's a nice graphical summary represented as a pyramid with the most potent forms of argument at the top:
If we all try to stay nearer the top of the pyramid it can only be good for the quality of debate on here.
Thanks for this Nick - it looks to be an excellent way to help keep us all on track. Perhaps we could start a new thread on discussing exactly what an "ass hat" is - I've never heard of one before and the mind boggles. Then again, is it just knickers?