"Simply enter demographics and sites associated with your target audience, and the tool will return information about sites (both on and off the Google content network) that your audience is likely to visit. You can drill down further to get more detail like demographics and related searches for a particular site, or you can get aggregate statistics for the sites you've added to your media plan. (...) Using Google Ad Planner, you can quickly create media plans and export to a .csv file, which can be opened in most spreadsheet applications. Or, you can export to DoubleClick's MediaVisor, which helps you manage all your other media planning, buying and campaign management activities."
Apply for Google Ad Planner beta login here.