phpawy

Using this plugin, you can embed Google Maps into any post. inserting Latitude, Longitude and Zoom level will show the location inside post using Google Maps.
<h3>Important Notice</h3>
This plugin utilizes Google Maps JS API. The coordinated you enter is sent to the API to show the corresponding location’s map.

Simple Google Maps

Simply allowing you to add Google Maps to your posts.

webcat

The plugin aims to provide a quick and easy way to store googlemaps on your blog. By storing maps, requests to google map api are kept minimum 
and the possibility of not having a map show up on your page if google service is interrupted is reduced. Shortcodes are provided in the editor to make including a map you have created 
even easier.
Planned extensions will include editable notes for map flags and ajax to make creating a map more intuitive and support for the javascript and google 
earth apis.
<h3>6.0</h3>
*BETA 
*appologies if updates have not been working – now corrected. 
*html notes can now be added to flags – tested with
<
p> and <a> 
*code tidied up 
*Planned – include links or trackbacks in flags and a map key that can be displayed as a widget so that flags are colour coded 
*Remaining – include further features including paths and further javascript features</a>

googlemapsForWP

Quick and easy management of google maps to display on your blog.  Supports static maps api

Simple Google Maps vs googlemapsForWP