Want to see where readers of your blog are geographically?
maps.amung.us might be a tool (toy?) that you find useful. Here’s the ProBlogger reader map (it could take a little time to populate – but it is supposed to be flash based so it won’t need to refresh the page to update)!
Of course it only tracks visitors on the page/s that you run the map on. So this map will only show visitors to this actual post or the blog (until this post drops off the front page). To get around this you could put it in your sidebar.