Yowsa! Looks like Yahoo! is going! gangbusters! into social! software!, putting Google and MS (other than Wallop) on the defensive. Yahoo! 360 went non-invite recently and now there's MyWeb 2.0. The new MyWeb looks like a del.icio.us knockoff but leveraging and integrating existing Yahoo! features like group management and search.
And to my eyes Yahoo! is just about this far from putting together an innovative social content media aggregator that puts a hurt on the rest of the market. They've got all the pieces (Flickr, YTunes, MyYahoo, MyWeb, 360, a directory, and search), the smart dev talent, and the commercial motivation.
Hat tip to John Battelle.