http://thesaurus.reference.com/

http://www.merriam-webster.com/thesaurus.htm

http://education.yahoo.com/reference/thesaurus/

http://encarta.msn.com/encnet/features/dictionary/DictionaryHome.aspx?lextype=2

http://freethesaurus.net/

http://www.ehow.com/how_2071481_use-online-thesaurus.html

http://www.merriam-webster.com/thesaurus/Enter%20a%20word%20or%20phrase...

http://www.visualthesaurus.com/

http://www.dictionarylink.com/

http://www.libraryspot.com/thesauri.htm

http://www.business.com/directory/media_and_entertainment/publishing/editorial_and_literary_services/translation_services/writing_and_language_tools/dictionaries_and_glossaries/

http://www.thefreedictionary.com/Dictionary.htm