Who uses a product like this? Advertisers, writers, word junkies or those that want to build their crossword/anagram skills.
You can try out the program by typing a word at the top of the web page. The results will be displayed with the links to the associations with the word in question. In addition to the program this website contains
Virtual Thesaurus can be rotated to show 3D views of the relationship with other words, additional languages and access to the magazine articles that are teased on the front page.
These features are not available in the online sample version.
This is not a free program. There are purchase options. You can buy the program or purchase a monthly subscription access online. http://www.visualthesaurus.com