When we are talking SEM - we often only think of Google and Google Adwords. But remember there are more search engines where you can put your ads. So even though Yahoo has a marketshare at around 7 to 9 precent - its still a lot of people coming there. And most of the time you can get a much cheaper click price at the other other search engines. Let me hear from you .. have any of you ever used Yahoo Search Marketing? Hit me a comment and show me you are alive :)