On the yourdictionary.com site there is a list of a 100 most often misspelled words. The site lists the words and then gives you clues to help you spell them correctly without a dictionary.
I also found another interesting list. It is a list of a hundred most common mispronounced words and phrases. I can take this list and help my children become aware of words and phrases that are mispronounced so much. You should read through it. It’ll make you laugh and surprise you about our English Language.