It would be nice to have an automatic spell checker while writing. It could do the check after pressing "Submit new post" and fix the major & some minor errors and maybe make the sentences begin with a capital letter & so on. That would make AO forums even more better.
If the message is full of misspellings it's rather difficult to read, and for a foreigner it's even more difficult.
... Well OK, there could also be an option "Disable automatic spell checker".