I'll just pop in here with some of my word-related pet peeves.
1) Loose being used in place of lose. As in:
"I thought that we were going to loose the game" or "I was afraid I was going to loose my magic sword."
I've been seeing this more and more on the boards lately, and it's too common for just accidentaly inserting an extra O. I've even seen people switch from loose, to losing, to loser, and back to loose, without even questioning their spelling.
Lose = to not win, to misplace, etc. "Our team will lose the game."
Loose = not tight, free. "His pants were too loose."
2) They're/There/Their
This has been a problem for as long as I can remember, and some people still don't get it right.
They're = they are. "They're living in a new house."
There = a place. "Over there."
Their = shows possesion. "That is their car."
These aren't all of them, but they are some of the most common ones. There are always more, such as too/to and effect/affect.
Luckily, I've gotten used to the Rouge/Rogue thing. It took years of therapy, but I'm finally over it. No more burning rage.... for now.