Yahoo Pipes is pretty darn cool. I know that it's been around for a while but I have just now given it a chance. I usually am not a big fan of what Yahoo does, I'm usually more of a Google guy, but they have done this very well.

For those of you that don't know what Pipes is or does it is an interactive data aggregator and manipulator that lets you mashup your favorite online data sources.

Pipes is a nice way to mash up rss feeds from multiple sites or a site with multiple feeds, like the Engadget blogs. I mashed up Engadget, Engadget Mobile, and Engadget HD. Pipes is also handy for filtering content that you don't want in a feed; for example, I found a pipe that filtered any posts about the iPhone from The Unofficial Apple Weblog feed.

All in all, I'm pretty impressed with Yahoo Pipes.