Pretty clever title thread there, Noddy!
I mess up all the time. But it is mostly when I am in a hurry or have a million things on my mind. Most of the time I know exactly what errors I have made in spelling and will go back and correct them and I always use spell checker for the ones I really overlooked.
As far as perfect punctuation and grammar go, I mostly wing it there and hope for the best. I don't mind if my errors are pointed out to me as long as it is constructive criticism. To flame just for the sake of flaming, especially openly, is rather rude in my opinion. I don't see rude flaming happening here on A2K.