I'm with you. My lack of spelling skills is surpassed only by my lack of typing skills. However, one of the greatest things I've ever seen in a thread happened about 5 or 6 years ago on a message board that I was a member of that don't think even exists anymore that was geared toward people in my profession. There was a member that was a HUGE know-it-all. He posted his opinion on something and another member made a comment along the lines of, "If you think that, then you're dumber than a bag of hammers." The know-it-all member shot back with 3 or 4 paragraphs about how he had been tested several times in his life and every test showed him to have a genius-level IQ. The problem? Three different times he misspelled the word "genius". I can't remember how he misspelled it, but it was the same all three times, so it wasn't a typo.
I know you can be very smart and not be a good speller, but, if you go on a rant about being a genius, it just looks bad when you misspell it...