I would love to have a search engine for feeds, let's say I search for 'Stuart Russel podcast' and it returns among others the after-on.com feed url. So the output is always a feed url.<p>As I pointed out before, it feels like you haven't found your niche yet, but you are close. I don't recommend building a search engine, cause For an end user it does not matter how a search engine retrieves its data, only the results matter. And here you will always loose. This place is too crowded.