This morning Microsoft and Yahoo have announced a 10 year deal in which MS will have access to Yahoo’s search technology (and presumably incorporate some of it into Bing) and Yahoo will take over as the main advertisement provider for Bing. There were talks a few months back between the two companies in which it was speculated that Microsoft would purchase Yahoo, but that deal fell through.
In case you’re not familiar with Bing, it is Microsoft’s new search engine (which they call a “decision engine”), which has replaced their former Live search engine. This is MS’ attempt to better compete with Google. In case you need some instruction on Bing, CollegeHumor.com made an “educational” video: http://www.collegehumor.com/video:1915736.