I was thinking that the best way for anyone to develop their arguing skills would be to switch sides, and try and argue as passionately for an entirely opposing view. It'll give you a better idea of what your opponents are thinking, and thus how you can fight it later. It may also change your views, or hopefully at least broaden them a little.
So I suggest we start a few topics where all posters have to post arguments from positions other than their own, preferably opposing views. It'll take a little more discipline when it comes to posting, I know there'll be a temptation to just go sarcastic, but as long as people stick to proper arguments, it should work well.
I don't have time right now to start one, damned sleep is catching up and i'm feeling sick from all the coffee, but I'll post topic titles with (RR) at the end.