A beta of the Yahoo RSS aggregator appeared -- and subsequently disappeared -- from the personalized 'My Yahoo' service late Wednesday, setting off buzz among RSS enthusiasts that a thumbs-up from a big-name company like Yahoo would speed up consumer adoption of the syndication format.
I don't think Yahoo would offer anything for free. Probably similar to Yahoo Shopping model. It will be free for a time so suppliers can get hooked and then it will be a charged service to get your feeds in. My guess.