Ben Burtt created some of the most famous movie sounds, including R2D2’s mechanical chatter and the whir of the light saber. Burtt is also the voice of WALL-E, the starring robot in Pixar’s 2008 animated movie. Kurt talks to Burtt about the legendary sounds of his career.
http://www.studio360.org/episodes/2009/02/04

You can download the interview from the link above.