You may have been taught at school that correct spelling does not matter, I understand that this is currently the fashionable position taken by a growing number of teachers of English.
But correct spelling does matter, for the simple reason that it ensures that your reader does not misunderstand your meaning, if for no other. There are plenty of people out there who will happily misunderstand what you write, given the opportunity. This is how flame-wars and libel cases start. It is better not to give them the opportunity in the first place, don't you think?
