I came to know about this plugin after my developer installed it in one of my sites. First, I was not sure how it works, but once I learnt to get my head around it, I have been very satisfied with this plugin.
You can have a loot at my page where I have installed it - to see how the output looks like.
This is a fantastic plugin for doing one thing. But if you are looking at doing more than one thing look at WP-Geo which also has this functionality plus more. http://wordpress.org/plugins/wp-geo/
This plugin does not work with custom taxonomies in the same way that it does with tags and categories nor does it allow one to choose more than one taxonomy. That is a bit disappointing.
The admin screen does not let the admin choose where the map viewer will be directed to. The viewer is directed to the tag archive. As an admin being able to direct someone to a page or other location is important. The WP-visited countries plugin allows the admin to select where the map user/view will be directed when they click on the map. http://wordpress.org/plugins/wp-visited-countries/
However, the user interface for selecting a location for a built in taxonomy is well done. It well implemented so that you can quickly and easily associate tag "terms" with a location.
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