I recently started using AdWords, and I've been thinking..... Picture the demographic of google users vs other search engines (yahoo, bing, etc). It seems apparent that users of engines like yahoo and bing are less "internet savvy," just for the fact that google is the default search provider for those engines. These 'newbs to the net' are more likely to end up downloading some file (like zango) or filling out some survey, just because they don't know any better. So wouldn't it make sense that those less internet-savvy users are more likely to convert for a CPA program? Does using yahoo search marketing increase conversion rates?