Joe Marchese in MediaPost this morning is a must read: http://www.mediapost.com/…lications/

Here's the best paragraph:
"Why can Microsoft succeed? Unlike Google, which focuses on mathematical media efficiencies, which means it is limited by what can be measured, Microsoft has a history of focusing on people's productivity. If advertising has taught me anything, it's that "Microsoft makes People-Ready business" ;-). Seriously though, productivity and efficiency are not the same thing in this case. The human element to advertising and marketing cannot be ignored; it's the classic art vs. science argument. Whereas Google's efficiency goals look to optimize the science, productivity focus means better enabling for the practitioners of the art."

This is why I love MediaPost. Writers like Joe really know the business of marketing at a deep level and they do a great job of summarizing and explaining the critical factors succinctly while covering a "meta category" like search advertising.