Sorry for taking so long to respond, didnt see your request till now.
I was running this out of Access (ick), although the idea is the same on any database (e.g. mySQL):
ExternalNewsSourceID -> autoNumber (internal unique id)
Title -> text (name of the site)
Link -> text (link to the site, not the source)
Description -> text (description of the site)
Source -> text (URL for the actual feed)
I populated this list by hand by selecting sources from xmltree.com.
Let me know if you need more detail.