Introducing Pipes: "What Is Pipes?
Pipes is a hosted service that lets you remix feeds and create new data mashups in a visual programming environment. The name of the service pays tribute to Unix pipes, which let programmers do astonishingly clever things by making it easy to chain simple utilities together on the command line.
Philosophy Behind the Project
There is a rapidly-growing body of well-structured data available online in the form of XML feeds. These feeds range from simple lists of blog entries and news stories to more structured, machine-generated data sources like the Yahoo! Maps Traffic RSS feed. Because of the dearth of tools for manipulating these data sources in meaningful ways, their use has so far largely been limited to feed readers."