Jon Stewart at Book Expo America

The trade fair Book Expo America featured a breakfast appearance by Jon Stewart, there to promote his new book, The Daily Show with Jon Stewart Presents Earth (The Book): A Visitor’s Guide to the Human Race. Ironically, Earth might not even be finished; during a recent episode of his podcast The Bugle, John Oliver mentioned that the manuscript was due at the end of May, and that "TDS"' writing staff would be scrambling to complete it during their current break.

According to a report at NYMag.com, Stewart poked fun at "Prairie Home Companion" host Garrison Keillor, who had recently penned an op-ed column for the New York Times lamenting "the end of an era" in publishing, thanks to the advent of self-publishing services like Lulu.com. "Funny, I thought [Keillor] was dead," said Stewart. "No one understands cutting-edge media like a man who does written radio plays about a fictitious town."

Stewart also quipped to former Secretary of State Condoleezza Rice, who was promoting her forthcoming autobiography, "I am not particularly familiar with her work–but I hear good things."

The panel is scheduled to air on C-SPAN's Book TV during the weekend of June 5.