As long as your message is easy to understand, I don't mind TOO much. What I really hate is someone who forgets all about capitalization, punctuation, grammar, & spelling as soon as they have a keyboard in front of them. I don't mind at all when it is obvious that someone is not to familiar with the Engilsh language(or American version of such) makes obvious mistakes, as this is one funky language. I make my share of mistakes, and some of them even make it through my "pre-post proofread", so I don't look for perfection, just an effort to make your post easy to read.