Homophone and Homonym Websites:

Alan Cooper's List: http://www.cooper.com/alan/homonym_list.html

100 Homonyms: http://homeworktips.about.com/od/englishhomework/a/homonyms.htm

A to Z List: http://www.zyvra.org/lafarr/hom.htm

Commonly Misused Words and Phrases: http://wsuonline.weber.edu/wrh/words.htm

Self Study Site: http://a4esl.org/q/h/homonyms.html

Readquarium: http://gamequarium.org/readquarium/homophones.html

Fun Brain Game: http://www.funbrain.com/whichword/index.html

Homonyms: http://editingandwritingservices.com/homonym-heaven/