Plug n Play Google Map
This plugin creates a google map on a Wordpress static page of your choice. Any post that you attach a latitude and longitude to will appear on the map as a marker, with a pop-up bubble and a link to the post.
OpenStreetMap plugin
OSM is a wordpress plugin that deals with geo data inserting a map with tracks and markers info to your posts and pages.
Wordpress Heat Map
The WordPress Heat Map plugin provides you with three new template tags for displaying a heat map (aka weighted list) of your categories, tags and monthly archives.