Google AdWords Ad Auctions Insights lets users run a report (only for individual keywords at the moment) and view half a dozen metrics against other advertisers. These include impression share, verge position, overlap rate, position above rate and top of page percentage.
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MSN Adcenter Improves Keyword Filtering Adobe Ads Feather to It's Internet Marketing Bow Facebook's Targeting Targeted by European Commission Extend Your Ads +1s to your Site Infographic: How the Adwords Auction Works
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