BlogDigger

Blogdigger uses state of the art syndication technologies, such as RSS and Atom, to index blog content and make it available for search. Blogdigger also makes all search results available in RSS or Atom, so users can subscribe to keyword searches and automatically be notified, via the News Aggregator of their choice, of new content pertaining to their interests. Blogdigger searches thousands of RSS and Atom feeds, and is built-in to many popular News Aggregators, such as FeedDemon and NetNewsWire.