There are several good interviews with Tracy Kidder available. You can download the Los Angeles Public Library and CSPAN interviews from iTunes. On Point brings in VHW's executive director Sarah Broom for the second half of the program and Radio Open Source goes deep on genocide and public health here.
Here is a short video excerpt of an interview from PRI's The World:
An Interview with Author Tracy Kidder from Clark Boyd on Vimeo.
Finally, be sure to check out this NYT editorial by Tracy Kidder: A Death in Burundi.