Except for very short bits of code (obvious stuff that we've all used hundreds of times), I test everything before posting and paste it straight from emacs. When something is untested or may not work as advertized, I'll say so.

I format pretty much like japhy, mostly straight out of perlstyle except for a few idiosyncracies. But I try to respect other people's coding styles--even when they are wrong, wrong, wrong; I only reformat when something is so godawfully written that I have trouble following it. I may unconsciously do it at other times, but I try not to.

As for testing other people's code, I only do that if it looks broken or really cool, or if I want a benchmark.