The Corybantic Podacast: Episode 6
Wherein I talk about my love for thesauri, particularly Roget's, and discuss how a thesaurus works.
You can read more about Peter Mark Roget at this article from the Merriam-Webster site.
If you want to see an excellent example of Roget's International Thesaurus, that's a lot closer to Roget's original layout than those dictionary-style thesauri one often sees, check out this free copy of Roget's International Thesaurus, 3rd ed.
[The theme music is "A Good Bass for Gambling," written by Komiku. It is in the public domain.]