A criminology lecturer at Bucks New University recommends that common spelling errors like "truely," "arguement" and "wierd" should be accepted as "spelling variants."
According to an article at BBC News, Ken Smith says that he has been correcting the same errors over and over again for so many years that he feels that the most common misspellings should just be accepted. "Twelth" should be an acceptable variant of "twelfth." Words that break the "i before e" rule should be made to conform to the rule.
"'The spelling of the word "judgement", for example, is now widely accepted as a variant of "judgment", so why can't "truely" be accepted as a variant spelling of "truly"?' . . . 'All I am suggesting is that we might well put 20 or so of the most commonly misspelt words in the English language on the same footing as those other words that have a widely accepted variant spelling'"