Clear Ink SpellWeb
   An evolving experiment in sidesifting the web for useful information. In this case, it lets the web vote on alternative spellings (or web popularity) of words.
   http://www.spellweb.com/

Speaking Writing
   Articles on speaking and writing, spelling quiz questions, grammar questions and writing and speaking rules.
   http://www.speakingwriting.com

Spelling Test
   A journalism professor and former copy editor offers an interactive test of 50 commonly misspelled words, as well as spelling tips.
   http://www.sentex.net/~mmcadams/spelling.html