Google is an interesting company and not only because it has superbig data centers and mighty algorithms. It is also interesting because it controls a pretty big pie of the Internet advertisement market and uses a fascinating auction system to sell ad space. Need traffic? You can either SEO your site to the max or just buy some advertisement. Google apparently has good prices and good results. At least Microsoft seems to think that: 
Yes, this is an ad for Bing in the first line. What is even more wondrous though is why Google would advertise (right column, third from the top) on the query “search engines” on their own site. AdWords must be very effective indeed.
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