smallcompany - 4:42 am on Jan 11, 2008 (gmt 0)
Enable report that shows performance (keyword, ad, ad group, campaign) per location and per language. Those two have always been part of each campaign.
Based on this, if we pick two or more countries and two or more languages, let us see how the cost varies between those. If language is a problem, countries only breakdown will do it just fine. Then, we can bring it down to states/provinces/regions/cities, etc. With this reporting power many advertisers would love the system.