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http://www.spelling-words-well.com/difficult-spelling-words.html

http://www.spelling-words-well.com/hard-spelling-words.html
http://www2.sharonherald.com/herald/nie/spellb/spelllist2.html
http://www.thevisiontherapycenter.com/discovering-vision-therapy/bid/81695/Spelling-Difficulties-in-Children-Caused-by-Vision-Problems
http://www.buzzle.com/articles/difficult-words-to-spell.html
http://dictionary.reference.com/help/faq/language/s37.html