The otherwise superb Chambers Dictionary that my parents bought me for Christmas lists the word “affluenza“, but not the word “afflatus“—checked in my Shorter Oxford before I deployed it yesterday. My edition of the Shorter doesn’t list “affluenza” of course.
PooterGeek is on the first page of Google hits for the misspelling of “autism” as “austism”—in the company of Massachusetts Department of Education. [Look in the title bar of your browser, not in the document itself.]
“Humorous” is spelt “humorous”, but “humorsome” is spelt “humorsome”. Why?
If you’re looking for word references on the Web, you could take advice from the American Library Association.