MoffJake chimes in:

Here is today's radio interview of Frank Oz from the Michael Medved show. In it they discuss the Attack of the Clones and Yoda as well as the films that Frank Oz has himself directed. There are also some decent calls from people around the country including someone in line at the Cinerama in Seattle! And if you stay tuned 'till the very end you'll hear some of your favorite Sesame Street Muppets!

Just to add to my description of the interview, there's some interesting information about how Frank Oz helped to develop the character of Yoda and how during the making of The Empire Strikes Back he wrote a history for Yoda. However when asked by a caller if he knew what species Yoda was, Frank Oz didn't know.

You can download the Frank Oz MP3 here (5.8 Mb, 34 minutes).