I hate seeing any words misspelled, especially misspelled itself. Everyone always seems to forget the second "s" in it. ><; And like everyone else has said, the grammar mistakes such as the too, to, two thing tend to annoy me as well...
And when people spell my name wrong. O_o; A-s-h-l-e-y... it's spelled the most common way, how hard is it to get right? XD