- (2002) Vocals in Warren Zevon's song "Hit Somebody! (The Hockey Song)"
- (October 1990) "David Letterman's Top Ten Lists" in "Playboy" (USA), October 1990, pg. 72-75.
- Nonfiction book: "Late Night With David Letterman: The Book"
- (1996) Foreword to book "Home Cookin' with Dave's Mom" by Dorothy Mengering (as Dave's Mom, Dorothy), with Jess Cagle. New York: Pocket Books, 1996, ISBN 0671000608
- (2009) Foreword (as Dave Letterman) to book "The Ride of a Lifetime: Doing Business the Orange County Choppers Way" by Paul Teutul Sr., with Mark Yost. Hoboken, N.J.: John Wiley & Sons, 2009, ISBN 0470449977
- (1989) Foreword to book "Daddy's Boy: A Son's Shocking Account of Life with a Famous Father" by Chris Elliott and Bob Elliott. New York: Delacorte Press, ISBN 0385297300.
- (1999) Introduction to "Bobby Rahal: The Graceful Champion" by Gordon Kirby. Phoenix, Arizona: David Bull Publishing, ISBN 096497228X
- (November 3, 1976) Guested on the daytime game show, "Celebrity Revue". Other guests included co-host for the week Vince Edwards, Mimi Hines, Mickey Gilley and Pete Barbutti.