I don't really mind much on live chats, message boards, etc. What irks the crap outta me (heh), is "between she and I," used in books, magazines, television, etc. Children may learn grammar in school, but they really learn it by what they hear and read, so it bothers me a lot when so called professional writers get it wrong. For just plain folks, all I ask is the occasional paragraph break so my eyes don't turn the post into some kind of psychedelic design.
"Right is right, even if no one is doing it; wrong is wrong, even if everyone is doing it." - St. Augustine