Feed your head
I was toying with horrendous bash scripts and XSLT stylesheets to manipulate XML from the Internet Archive, and thought an obvious application would be to make podcast feeds so stuff could be downloaded semi-automatically by people without bash/xsltproc/etc know-how. Looking around the web, I found that OPML seems to be the standard for collections of RSS feeds, so I made an OPML feed of the RSS feeds I created for the audio stuff of mine on the Internet Archive:
EDIT 2014-03-07 this bitrotted, sorry...