Yahoo is now a media creation and curation company. Yahoo Sports is number one, Yahoo News is top five (HHS Secretary Sebelius had an exclusive op-ed in YN yesterday), OMG is killing TMZ and others, and so on and so forth. Yahoo's strategy of original content and great curation is all about stickiness. Let's be clear - Yahoo will still sell the very best ads for themselves, and Microsoft gets that sales expertise as well. No one on the face of this earth sells premium online ad space better than Yahoo.
Yahoo has clearly decided that they won't play in search any more, and that's a rational decision - they only played in search for a small period of their history. They were powered by Inktomi before Google, and now will be by Bing for the next ten years, and presumably something other than Bing after that.