If it actually happens this time…. the deal is a good news bad news thing for advertisers and consumers. The current iteration being tossed around the media is that MS will control Search on both Yahoo and Bing and that Yahoo will control ads on both sites.
I like the idea of making one ad buy that gets me both Yahoo and Bing, it just makes management easier for the 25% – 30% that isn’t Google. But, I’m not sure I like the idea that there are really only two search engines of importance from a natural search standpoint. It will be interesting to see how they roll that out. Will Bing simply take over Yahoo SERP’s or will there be a mixing of the two?
Also, how do we SEO’s deal with them? An 800 lb. gorilla (Google) and a 600 lb. gorilla (Yahoo, Bing hybrid)?