I'm using a program called
Miro to download audio / video podcasts nowadays. Here's an
OPML dump of the liberty-related audio and video channels I'm currently subscribed to. In theory you should be able to paste the below markup into a file and import it into other podcatchers, but no guarantees:
<?xml version="1.0" encoding="utf-8" ?>
<!-- OPML generated by Miro v2.0.3 on Sun Mar 15 08:25:35 2009 -->
<opml version="2.0"
xmlns:miro="http://getmiro.com/opml/subscriptions">
<head>
<title>miro_subscriptions_20090314.opml</title>
<dateCreated>Sun Mar 15 08:25:35 2009</dateCreated>
<docs>http://www.opml.org/spec2</docs>
</head>
<body>
<outline text="Libertarian" miro:section="video">
<outline type="rss" text="RonPaulvsTyranny" xmlUrl="http://gdata.youtube.com/feeds/base/users/RonPaulvsTyranny/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" miro:autoDownload="all"/>
<outline type="rss" text="dollarisdead" xmlUrl="http://gdata.youtube.com/feeds/base/users/dollarisdead/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" />
<outline type="rss" text="dmgoddard" xmlUrl="http://gdata.youtube.com/feeds/base/users/dmgoddard/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" />
<outline type="rss" text="robpatozz" xmlUrl="http://gdata.youtube.com/feeds/base/users/robpatozz/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" miro:autoDownload="all"/>
<outline type="rss" text="AnarchyInYourHead" xmlUrl="http://gdata.youtube.com/feeds/base/users/AnarchyInYourHead/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" miro:autoDownload="all"/>
<outline type="rss" text="AnarchoJesse" xmlUrl="http://gdata.youtube.com/feeds/base/users/AnarchoJesse/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" />
<outline type="rss" text="obscuredtruth" xmlUrl="http://gdata.youtube.com/feeds/base/users/obscuredtruth/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" miro:autoDownload="all"/>
<outline type="rss" text="bikerbillnh" xmlUrl="http://gdata.youtube.com/feeds/base/users/bikerbillnh/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" />
<outline type="rss" text="HomelandStupidity" xmlUrl="http://gdata.youtube.com/feeds/base/users/HomelandStupidity/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" miro:autoDownload="all"/>
<outline type="rss" text="bureaucrash" xmlUrl="http://gdata.youtube.com/feeds/base/users/bureaucrash/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" miro:autoDownload="all"/>
<outline type="rss" text="TackleTheWorld" xmlUrl="http://gdata.youtube.com/feeds/base/users/TackleTheWorld/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" miro:autoDownload="all"/>
<outline type="rss" text="naconner" xmlUrl="http://gdata.youtube.com/feeds/base/users/naconner/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" miro:autoDownload="all"/>
<outline type="rss" text="RidleyReport" xmlUrl="http://gdata.youtube.com/feeds/base/users/RidleyReport/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" miro:autoDownload="all" miro:expiryTime="never"/>
<outline type="rss" text="freestatereport" xmlUrl="http://gdata.youtube.com/feeds/base/users/freestatereport/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" miro:autoDownload="all"/>
<outline type="rss" text="FreeKeene" xmlUrl="http://gdata.youtube.com/feeds/base/users/FreeKeene/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" miro:autoDownload="all"/>
<outline type="rss" text="blogofbile" xmlUrl="http://gdata.youtube.com/feeds/base/users/blogofbile/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" />
<outline type="rss" text="mcmikemn" xmlUrl="http://gdata.youtube.com/feeds/base/users/mcmikemn/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" />
<outline type="rss" text="ShuvomInNH" xmlUrl="http://gdata.youtube.com/feeds/base/users/ShuvomInNH/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" />
<outline type="rss" text="WalkForLiberty" xmlUrl="http://gdata.youtube.com/feeds/base/users/WalkForLiberty/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" />
<outline type="rss" text="politicalGRAFFITI" xmlUrl="http://gdata.youtube.com/feeds/base/users/politicalGRAFFITI/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" />
<outline type="rss" text="DadaOrwell" xmlUrl="http://gdata.youtube.com/feeds/base/users/DadaOrwell/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" miro:autoDownload="all"/>
<outline type="rss" text="braintaser" xmlUrl="http://gdata.youtube.com/feeds/base/users/braintaser/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" miro:autoDownload="all"/>
<outline type="rss" text="Powertothepeopleprod" xmlUrl="http://gdata.youtube.com/feeds/base/users/Powertothepeopleprod/uploads?alt=rss&v=2&orderby=published&client=ytapi-youtube-profile" miro:section="video" miro:autoDownload="all"/>
</outline>
<outline text="Libertarian" miro:section="audio">
<outline type="rss" text="Liberty Conspiracy" xmlUrl="http://feeds2.feedburner.com/libertyconspiracy" miro:section="audio" miro:autoDownload="all"/>
<outline type="rss" text="Brian Wilson" xmlUrl="http://www.wspd.com/podcast/Brian.xml" miro:section="audio" />
<outline type="rss" text="Free Talk Live" xmlUrl="http://freetalklive.com/netcast.xml" miro:section="audio" miro:autoDownload="all"/>
<outline type="rss" text="The Lew Rockwell Show" xmlUrl="http://www.lewrockwell.com/podcast/feed.xml" miro:section="audio" />
<outline type="rss" text="Complete Liberty Podcast" xmlUrl="http://completeliberty.libsyn.com/rss" miro:section="audio" />
<outline type="rss" text="Free Minds TV & Radio" xmlUrl="http://freeminds.podbean.com/feed/" miro:section="audio" miro:autoDownload="off"/>
<outline type="rss" text="Liberty Week" xmlUrl="http://www.libertyweek.org/?feed=podcast" miro:section="audio" />
<outline type="rss" text="Bureaucrash - Join the Resistance" xmlUrl="http://bureaucrash.com/?feed=podcast" miro:section="audio" />
<outline type="rss" text="Antiwar Radio with Scott Horton and Charles Goyette" xmlUrl="http://feeds.feedburner.com/AntiwarRadio?format=xml" miro:section="audio" />
</outline>
</body>
</opml>
(I edited out all the tech video feeds I watch for sake of briefness. And, yes, I know it's missing two LRN items - I get my Onion fix in video and I haven't gathered up the courage to dive into FDR yet.)
Most of those are just YouTube feeds, but one can set up feeds distributed through HTML / FTP, and even BitTorrent. Using the latter, it would be possible to host large quantities of high-quality video at very little cost.