Yahoo Pipes

Yahoo Pipes is a new beta service that is "an interactive feed aggregator and manipulator. Using Pipes, you can create feeds that are more powerful, useful and relevant." So, basically, a feed mashup service. Some examples of popular pipes are a mashup of all the Yahoo blogs, find an apartment near something, eBay price watch, and the pipe of my dreams: a del.icio.us flavored websearch. Now I can, at last, easily search my del.icio.us!