Build your own mashup with Yahoo Pipes
I came across this about a week ago. It was so popular that Yahoo couldn’t handle the load. It’s basically a nice GUI for building mashups, and it’s very slick. From Yahoo! -> “Pipes is an interactive feed aggregator and manipulator. Using Pipes, you can create feeds that are more powerful, useful and relevant”. Check it out at Yahoo Pipes.
Read reviews at TechCrunch and Cnet.