FeedBurner, now allows publishers to analyze bit more information about thier uers with "Map Overlay" feature, that provides a breakdown of the previous day's item statistics from a geographic perspective for feeds with item stats enabled. From your AdSense account, clicking Manage Ads and then "View Feed Stats" for the feed whose map you wish to view. At the top, you'll find a world map visualization that shows countries with more item views as more intense shades of green. Hovering over a country shows the name of the country and the exact number of item views.