CaRP: Caching RSS Parser - Documentation
CaRP Interactive FAQ
Try going to Google News
, Yahoo! News
, or some other news search site and peforming a search. Then look for an orange XML icon or a link to an RSS feed of the search results. Copy that link and use that URL in CaRP. Be sure to check the site's terms of service to ensure that your use of those search results doesn't violate their terms.