Yahoo Pipes
If you routinely read a lot of feeds or many different sites on the internet, then Yahoo pipes may be for you. Granted it is very hard to get your head around at first, but then hang on as the possibilities are unleashed.
From Wikipedia: Yahoo! Pipes is a Web application from Yahoo! that provides a GUI-based interface for building applications that aggregate Web feeds and other services, creating Web-based apps from various sources, and publishing those apps. The site works by letting users “pipe” information from different sources and then set up rules for how that content should be modified (e.g. filtering). A typical example is New York Times thru Flickr, a pipe which takes the New York Times RSS feed and adds a photo from Flickr based on the keywords of each item. The site is currently in beta.
A Brief Tutorial:
