Here is a list of the product design podcast list I will be updating it.
Icon-o-Cast: A podcast by Lunar Design
A podcast from a San Francisco design firm.
Design Critique: Products for People
Tim and Toms design excellent podcast reviewing usability of random products.
Industrial Designers Society of America (IDSA) Podcast
A good selection of interviews of people in the American design industry, although it can draw on for a while.
South by Southwest Festival 2007
A collection of podcasts by the SXSW festival, there are some great ones by Bruce Sterling.
TED Technology, Entertainment and Design
A great conference about tech, there are some amazing speakers here. Some very smart people.
A collection of information architects, but there is some good design work tucked away.