Format
The show dealt with topics in the news regarding science, skepticism, religion, entertainment and politics. Jillette promoted his libertarian and atheist perspectives from the "nut point of view" to encourage listeners to call and email with their stories and opinions about the topic. Early shows tended to be without structure, with Jillette and Goudeau talking about whatever came to mind, taking the occasional caller and reading the occasional email. Later shows had tended to formalize around a current topic and a call-in talk show format.
Jillette and Goudeau would usually broadcast from Jillette's Vegas area home ("The Slammer"). The broadcast was done from Jillette's personal recording studio, Vintage Nudes Studio.
Celebrity guests, usually friends of Penn, often featured on the show. Guests included Criss Angel, James Randi (often with Paul Provenza), Mac King, Gilbert Gottfried, Trey Parker, Joe Rogan, Dennis Miller, Lisa Lampanelli, and Lawrence O'Donnell (nicknamed L.O.D. by Jillette).
Penn Radio was well known for its special feature "Monkey Tuesday", which was discontinued in January 2007 (soon superseded by "Pull of the Weasel Friday").
Penn often requested people send him a "gmail" at PennRadio@gmail.com, or to call the studio. The phone number for the studio was +1-866-313-FREE, but as of June 2006 it changed to +1-866-570-PENN due to problems often experienced on the show with phone calls being directed from FreeFM's New York City-based call center. Penn tried to get a toll free number with 666 but was unable.
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