I've used Audacity for some small audio edits, and it works.
One good site if you're interested in the audio production of a podcast or a radio piece is
transom.org. It was started by
Jay Allison. It was lying stagnant for a while, but it's started to have regular content updates.
If you go there, click "
Tools", and read the older articles, you will find that the radio production "software of choice" is ProTools, which is a software package that requires a specific hardware interface and costs a lot. There used to be a free version, but not anymore, so
transom.org was looking for alternative free software for beginners. They have reviews of two alternatives for audio production:
Hindenburg, and
Reaper, as well as two iPhone apps for recording (and actually editing on the iPhone) called "Monle" and "Hindenburg Mobile".
I just installed "Hindenburg Lite" from the app store (which I'm guessing is the new name for the Mobile version), but I have an iPod Touch with no microphone so it won't work until I buy or make a cable to hook up a microphone. It doesn't advertise the details of the recorded file (sampling and bit rate, for example), so I don't know what it can do. I'm not planning to edit on the iPod, but to just use it as a recorder for when I don't have my good recorder with me.
This American Life produced a comic book about radio production called
Radio: An Illustrated Guide. A review and short excerpt
here, although it's $5, not $40. (I own a few copies.)
There's a neat book called "
Sound Reporting: The NPR Guide to Audio Journalism and Production", but it's much more about journalism and the specific jobs at NPR such as reporter, producer, editor, host, etc, than about the specifics of picking microphones and recorders. I know it's used as a textbook in university journalism courses, but I really enjoyed it (being an NPR addict for the last 17 years or so). It really opens your eyes to some of the ethical and fairness issues in media. I got a copy from the library, but I eventually bought a copy, too. (Certainly more than you need for a podcast, though...)