Zack writes, "In 1947, Mel Blanc, the voice of Bugs Bunny, the Road Runner and other beloved cartoon characters had his own radio show spinning out of his appearances on Jack Benny's program, where he played a fix-it shop owner. More than 40 episodes are available to legally download for free on this page."
Mel Blanc's success on The Jack Benny Program led to his own radio show on the CBS Radio Network, The Mel Blanc Show, which ran from September 3, 1946 to June 24, 1947. Blanc played himself as the hapless owner of a fix-it shop, as well as a wide range of comical support characters.
Other regular characters were played by Mary Jane Croft, Joseph Kearns, Hans Conreid, Alan Reed, Earle Ross, Jim Backus, Bea Benaderet and The Sportsmen Quartet, who would supply a song and sing the Colgate Tooth Powder commercials.
For 50 years, Mel Blanc was the voice of many popular cartoon characters including Bugs Bunny, Daffy Duck, Porky Pig, Foghorn Leghorn, The Tasmanian Devil, Pepe LePew, Marvin the Martian, the RoadRunner ("Meep, meep!"), Barney Rubble, and Woody Woodpecker.
(Thanks, Zack!)