Merriam-Webster dictionary & thesaurus site http://www.m-w.com
Dictionary, thesaurus, and useful resources http://dictionary.reference.com/
3-Dimensional words http://www.visuwords.com
Rhyming dictionary & thesaurus http://www.rhymezone.com
Bibliography format (MLA & APA styles) http://www.noodletools.com
Newbery Medal winners and Newbery Honor book lists http://www.ala.org/ala/alsc/awardsscholarships/literaryawds/newberymedal/newberymedal.cfm
Wordmasters official site http://www.wordmasterschallenge.com/
Quizlet (make vocabulary flashcards and play vocabulary-building games) http://quizlet.com/
Mr. Dowling (history lessons and interactive quizzes) http://www.mrdowling.com/