Niall Kennedy has exposed a way to what amounts to be an unofficial MyYahoo RSS API, which can be used to…

….construct a new aggregator interface completely powered by Yahoo! on the backend and extended by individual developers for the best user experience and ease-of-use. In my limited testing I believe it is possible to build a Yahoo! desktop aggregator for Mac OS X using Cocoa, WebKit, and CoreData….

Oh oh… there goes Yahoo’s advertising opportunity! But more than that, I think this will be a true test of how much Yahoo really buys into the new Internet’s mash-it-up culture. Also wondering, does this mean a security risk? Smarter minds might have an answer.