NB: Audacity, for patent reasons, can't directly export MP3 files - you have to download a separate MP3 encoder file known as LAME and place that on your machine - see the Audacity FAQ for details and links to the LAME downloads for Windows and Mac. Audacity is available for PC, Mac and Linux. For editing your podcasts (or any audio clips) a very good, and recommended tool is the free, Open Source, and highly-featured Audacity, which you can download from the Audacity website.
