AdSense Vs AdCenter

Finally Microsoft is following in Google way...from a Leader to Challenger. Microsoft now officially entered world of context sensitive advertising. Started the project with the name MSN AdCenter, later they changed the name to Microsoft AdCenter. What is the reason behind this re-branding? There has been a lot of news about contextual advertising that compete with Google AdSense and Yahoo Publisher Network since two months. Microsoft may drop Yahoo ads on it's web sites to some extent. Microsoft is saying their AdCenter advertising is superior to Google's AdSense in many ways.

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How does search advertising work?
-Advertisers can pay only when people click their ads.
-Advertisers can set their own price per click.
-Advertisers ca see when clicks lead to sales.
-Advertisers target ads to the times, places, and customers they want the most.

Related:
-Search Engine Watch
-MSN Advertising