Feldman is the author of several books: Wisconsin Curiosities: Quirky Characters, Roadside Oddities & Other Offbeat Stuff; Something I Said?: Innuendo and Out the Other; and Thanks for the Memos. In addition, he edited Glad You Asked: Intriguing Names, Facts, and Ideas For the Curious-Minded, in partnership with Encyclopædia Britannica.
In the audio world, Feldman has produced two CD compilations of his radio show, Roadkill! The Best of Michael Feldman's Whad'ya Know... On the Road and Why Not: Best of Michael Feldman's Whad'ya Know, as well as a six-CD collection entitled Whad'ya Know? About the Classics.