Pipes – Interactive Feed Aggregator and Manipulator
http://pipes.yahoo.com/pipes/

Pipes is a powerful composition tool to aggregate, manipulate, and mashup content from around the web. Like Unix pipes, simple commands can be combined together to create output that meets your needs. Here are a few popular ways the service can be used: a) create your ultimate custom feed by combining many feeds into one, then sorting, filtering and translating them, b) geocode your favorite feeds and browse the items on an interactive map, c) remix your favorite data sources and use the Pipe to power a new application, d) build custom vertical search pages that are impossible with ordinary search engines, e) power widgets/badges on your web site, and f) consume the output of any Pipe in RSS, JSON, KML, and other formats. This has been added to Bots, Blogs and News Aggregators Presentation Page. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This gas been added to World Wide Web Reference Subject Tracer™ Information Blog.