This is a step in the right direction. However, I would argue that they need to take it a step further and give advertisers more control over where ads are listed. Google gives advertisers much more control. You can even specify at the campaign level whether to run ads only for searches initiated at Google.com. If I could do the same at Yahoo, I would spend more advertising with them. In my experience, visitors that come from searches at the major engines view significantly more pages than those that come from partner sites.