I'm an I/T professional by trade, when I update technical documentation or e-mail techs and such I double check for grammar, punctuation, etc. etc., plus use spell check, but when I'm on therx, of messing aound IM'ing, I'm from the type it, rip it, don't edit it school.
BillsGirl gets on my case all the time when she reads any typos I make here.