Meet ctrlQ.org – a search tool to help you discover RSS feeds around your topics of interest. You may use ctrlQ to find feeds for blogs, news websites, podcasts, and more.
A unique feature (see video demo) of this tool is that it you can preview feed content inline, from the the search results page itself, thus making it easier for you to decide whether a site / feed matches your interest or not.
You may use any of the Google advanced search operators – like site, allintitle or inurl – in your queries to further refine your search results. If you find an interesting feed, hit the corresponding Subscribe link to subscribe to that feed in your preferred news reader.