Thesauri in 2011

Thesaurus of English Words and Phrases, Classified and Arranged so as to Facilitate the Expression of Ideas and Assist in Literary Composition by Roget, Peter Mark

The Well-Spoken Thesaurus: The Most Powerful Ways to Say Everyday Words and Phrases by Heehler, Tom

Roget's Thesaurus of Words for Intellectuals: Synonyms, Antonyms, and Related Terms Every Smart Person Should Know How to Use by Olsen, David, Bevilacqua, Michelle, Hayes, Justin Cord