LOL - I am cracking up reading everyone's pet peeves. I know I have already posted one of mine, but I just have to post few more. However, this has more to do with spelling than grammar.
I can't stand when people spell definitely with a's in place of the i's. I've seen it many different ways, but one example is definatly. Another thing that irritates me is when people add an 'n' to condescending. My old manager uses it all of the time and it drives me

! She would say "condeNscending."
I know, all of these things aren't really *that* important. Just my own neuroses, I suppose.
BTW, I have to agree with the people that mentioned there, their and they're. Along with to, too and two and your vs. you're. Oh, and the prolly. I actually saw someone spell it out here on the DIS like that the other day. I mean no offense to that poster, but I was actually shocked!
The your vs. you're always reminds of that episode of Friends where Ross & Rachel break up for good, so funny!
