I wanted an easy way to download a single enclosure from a podcast feed everyday. I also didn't want to use iTunes, because this download would need to sync with my Palm Centro for an alarm, and iTunes stinks at exporting things. So I used Automator and iCal to do it. I thought I would save someone else the trouble by listing the steps here. This is the feed URL I was interested in: http://www.npr.org/rss/podcast.php?id=510101 -- the single enclosure is a daily poem in the form of an MP3 file.
Here are the Automator steps:
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http://hints.macworld.com/article.php?story=20080722115331225