Another thing that pisses me off is text speak.
IMNSHO text speak is only acceptable when using a mobile phone and having to work within SMS's character limits. It really pisses me off when people have a full size keyboard in front of them and still do it.....
Oh - AND PEOPLE THAT WRITE ALL IN CAPITALS AND MAKE MY HEAD HURT DUE TO ALL THE SHOUTING!!!!!!!!!!! (and people that use way too many exclamation marks)
Oh - and people that use "your" instead of "you're" and vice-versa
Wow - I could go on all day!