RSS Mixer allows visitors to efficiently mix multiple feeds into one. The mixed feed is then available as a Web page, mobile formatted page, or embedded into an Apple, Yahoo!, Vista, and Web widget.
RSS Mixer is also a searchable directory containing thousands of mixes, tens of thousands of feeds, and millions of posts.
RSS Mixer has two primary backend components - a fetcher (a proactive caching HTTP proxy), and a feed parser. Both can scale over clusters of computers.