If you're looking for a way to combine RSS feeds or to amass web conversations, try Yahoo Pipes. Yahoo Pipes can be used “to aggregate, manipulate, and mashup content from around the web” at your whim. This tool can be used for entertainment and education—a rare combination these days. There are currently pipes for Popular Music, Twitter Monitors, Google Image Searches, etc; because Pipes takes already existing content on the web and pushes it together, streamlines it, and filters it according to the parameters you need.
