For some of you who have an itching to fix grammar, spelling, etc.; rather than change other authors' text, how about insert a SicNote next to the alleged problem, along with square brackets? That way you can mark problems without having to change actual text. It's a decent compromise in my opinion and won't trigger the nasty EditWars often associated with such edits.
Example:
The rain in Spain stays mainly on the plane [SicNote: "plain"] according to Dr. Zammo. --FredSample
I thought this page was going to propose the marking of every post with an all-encompassing "[sic]", in order to make the post incorregible in principle, as a desperate measure against GrammarVandal!