Vinny Lingham reports finding a new metric on his Google AdWords console named Impression Share. Impression Share is a statistic available at both the campaign and account level, which shows the share of all impressions an ad earned against others that are competing for those. From the help pages:

Campaign: If an advertiser has more than one campaign competing in the same target market, the resulting impression share for any one campaign won’t be penalized if it loses an impression opportunity to another campaign from within the same account.

Account: Reports at this level will not penalize your impression share from the competition across all your campaigns.

The AdWords help page has examples and more detailed explanations. Vinny Lingham explains how this will affect the “relationships between both Search Affiliates & Search Agencies.”

Related Topics: Google: AdWords

About The Author: Barry Schwartz is Search Engine Land's News Editor and owns RustyBrick, a NY based web consulting firm. He also runs Search Engine Roundtable, a popular search blog on very advanced SEM topics. Barry's personal blog is named Cartoon Barry and he can be followed on Twitter here. For more background information on Barry, see his full bio over here. See more articles by Barry Schwartz