Yesterday, the Inside AdWords blog reported that Google AdWords now gives you a Geographic Performance Report so that you can get "geographic distribution of your impressions, clicks, and conversions down to the ad group level." Here's one screenshot that we were able to get from our Google AdWords accounts:
Already, this seems to be a great addition to help generate ideas. Forum members are overall very happy to see this addition but one member says to use caution when interpreting metro and city level data since the data shows an abnormally high CTR in some areas versus others.
It's also helpful to note that Google only has a little over a year of data. The reports go back to May 27, 2007.
Forum discussion continues at WebmasterWorld.