We use a custom built php application to write our feed to itunes. I can send you a link to the code if you wish. If that's the application you were referring to, then let me know. Otherwise there is Audicity for recording, and also a few mac applications to parse the feed data. We prefer to do it on our website though, so we don't have to keep uploading the xml feed file after we make changes.
Apple doesn't necessarily like "Podcast" type apps so you should be ready for it to be rejected. Not saying that it will be rejected, but a lot of people have had it happen in the past. They usually tell you to build an HTML5 version blah, blah, blah...
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