The Big Blog Map wordpress plugin allows you to Geotag posts so that they appear on a Google map. The Big Blog Map is great for
Travel Bloggers - Share your route with friends and family
City Bloggers - Map your favourite cafes, restaurants and bars
Pirates - Write blogs about where you store your treasure
Installation:
Install and activate
Go to 'Pages' and click on the newly created 'Big Blog Map' Page
Check out your map and cutstomise it
Geotag your posts by editing them and clicking on the map beneath the content area
IMPORTANT: The map will not work properly until at least 2 posts are tagged