Stefano Garuti

This plugin allows you to directly embed Gmaps code in your posts or pages using the [gmap] shortcode.
HOW TO USE IT: 
When you are in the Write Post or Write Page screen, find the “Custom Fields” area. 
If isn’t already there, add a custom field named exactly “gmap” (without quotes) and copy and paste 
in the value field the whole code you obtained from Google Maps. 
Write anywhere in your post or page the “shortcode” [gmap]: when displayed on the blog it will be 
repalced with your Google Map. 
Save and publish. You are done!
UPDATE and NEWS at: http://www.wpmania.it/google-maps-mania-plugin/

GmapsMania

This plugin allows you to directly embed Gmaps code in your posts or pages using the [gmap] shortcode.

Aneesh Dogra

“Geolocate My Posts” adds location to your posts, including a nice map, using geolocation and the Google Maps API.

Geolocate My Posts

A Wordpress plugin that tags the location of your posts using the Google Maps API.

GmapsMania vs Geolocate My Posts