In a fascinating and wide-ranging conversation, design historian Steven Heller talks about design and his recent book 100 Ideas That Changed Graphic Design with Debbie Millman on Design Matters:
Design Matters: Steven Heller mp3
Heller really is an astonishingly prolific author.
(Full disclosure: 100 Ideas That Changed Graphic Design is published by Laurence King and is distributed in Canada by my employer Raincoast Books)