Some people have called it a "mash-up generator". It's Pipes and it's now in the Web 2.0 Beta over at Yahoo!. You can take data from RSS feeds or other sources and cross-reference them with something else. For example, I found a Pipe that would allow me to view only the eBay auctions that match Phil Keaggy and are priced between $5 and $20. To be honest, most of the Pipes look like they're just a copy of the RSS feed, but whatever. Someone claims that they're similar to relational databases, but I don't know if I agree with that. I'm sure people will do cool stuff because there's even such things as a Google Maps module. Who knows, somebody might create the next big thing on this, I dunno.