I often type "your" when I mean "you're" or vice versa. In fact, for some strange reason I'm more likely to get that wrong than right, despite the fact that I fully understand which word is right.

My spelling and typing skills are abysmal for a man who was blessed with my education.

For example...have I just spelled abysmal correctly?

I'll have to look it up, just to be sure.

Why? I don't know. I use that word all the time, but that's just one of those words that I'm never quite sure about.

Ridiculous is another example of a word I often misspell. Corporation one I usually mistype, and government, another.

When I'm on a tear to get my thoughts down in ASCII, of course, those issues become less and less important to me.

That's what copyeditors are for.

Some people can just SEE the errors that we can't when we're editing our own work.