Separated into 3 levels of difficulty, these free interactive vocabulary puzzle and activity sessions use Latin and Greek "roots and cells" to help decode words. 7 links to current exercises include: Fill-in-the-Blanks, Definition Match, Synonym & Antonym Encounters, Crosswords, Word Finds, True/False and Word Stories. See our suggestions on How to use Vocabulary.com!
This site is a great way for anyone to expand their vocab. It allows teachers and students to create lists and has thousands of already made lists from literature, speeches, history, current news, plus more.
Lexipedia has a great looking interface which will make you children want to look up words. Type or click on a word to make a word web and see definitions.
http://ictmagic.wikispaces.com/English
Super! I think how it highlights words, has a picture dictionary and audio pronunciation of words/vocabulary, translation feature... offers a great deal in support of reading and language.