Check out Transom’s website.
They describe themselves as "an experiment in channeling new work and voices to
public radio through the Internet, for discussing that work, and
encouraging more. Learn about how Transom works and how you can submit your work for consideration."
The site has really great material on conducting interviews, reviews of equipment, and the latest in setting up a top-of-the-line audio studio, with costs in mind. This is a great place to start your shopping and/or think about recording history through human voices.
Link to Transom