Keyborad instead of keyboard comes to mind.

Also, about 50% of the times I need to type two of the same letters in a row, I'll end up typing just one of them. Letters becomes leters, etc. It has nothing to do with my typing, it's the dirt in my keyboard... the key will still be 'down' when I hit it the second time, so it doesn't register.

Another really annoying habit I have is hitting the post button before I check for any misspells. I check for them after posting, so the vast majority of my posts is edited because I always make some silly typo. And I can't just leave a misspell in there if I can help it. I guess it's a form of OCB. Or maybe I'm just a perfectionist.

Thing is, I know how to spell almost anything, it's just that I'm a lousy three finger typer. I have a very visual memory for how words should 'look'... I also pronounce the word in my thoughts in such a way that I know which letters I need to type. It's a thing I taught myself when memorizing words. It's an auditive memory for spelling, if that makes any sense.