The mistakes he made would not be caught by spell checkers, I think. What good grammar checkers are there? It seems Firefox comes with some spell checking functionality (at least it corrects me when posting on the net), but I have no idea how good it is. I think not that good...
On a post to a forum like this, of course not.
But not even running your own blog post through a spell or grammar checker?
Unakseptibal!