This website provides a map of where visitors to your site are coming from; the red dots indicate the regions where visits are originating from. I find it quite good and you can add it to your blog.
http://clustrmaps.com/counter/register.php is the registration address.
After registering, an email will be sent to your inbox. In that email, you'll find a password:XXXXXXXXXXXXXX. That's your password afterward, which may look messy, so it’s recommended to copy it and paste it when logging in.
After registration, add this piece of code to your blog customization panel, and change the blue part to your own information, and it will work.