GeoSmart automatically adds city-precise location information for each comment author to comment metadata for each comment and a map showing comment author location distribution. GeoSmart also ships with a multiple instance capable sidebar widget that displays a map showing the locations of the most recent visitors to your blog.

GeoSmart

Automatically adds city-precise location information of comment authors to comment metadata.

IP2Location

This plugin add awesome functionalities to track your website visitors GeoIP location by country & city then show you how to display a map of all the 100 most recent visitors to your website or blog. It displays information such as where the visitors came from (city, region and country) and the time of their visits in a table form and graphical map. This plugin is absolutely simple, flexible and free. The geo location information is powered by <a href="http://www.ip2location.com" rel="nofollow ugc">IP2Location</a>.
There is no registration, sign up, programming or database installation are required in order to use this plugin.

IP2Map

Widget to track visitors’ geo locations and aggregate them on a graphical world map display.

GeoSmart vs IP2Map