David Kipen interviews David Foster Wallace in San Francisco for City Arts & Lectures in 2004 - audio only.
Taken from here:
http://www.scpr.org/programs/madeleine-brand/2011/04/13/18656/book-critic-david-kipen-on-the-pale-king/
For more Wallace:
http://www.thehowlingfantods.com/dfw