"Many so-called podcatchers have shown up to help users download
podcasts on request. Most of them are great applications, but what
do you do when you want all of your podcasts downloaded
automatically and synced to your MP3 player? I used to use Monopod
to download podcasts and then move them to my MP3 player by
hand--until I found podget. Using podget, cron, and some shell
scripts, I was able to automate the whole process, saving myself 10
minutes and unneeded hassle every day.
"To get started, download podget, unpack it, and change into the
newly created podget directory. With sudo, or as root, run make
install, then run podget so that it can configure itself. By
default the first run will download several podcasts from a
predefined list. To disable this feature, pass podget the -C
option; this puts podget in cleanup mode..."