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.

Felix Triller

This plugin replaces coordinates, i.e. latitudes and longitues, between a [coord]-Tag with a link to Google’s map service.
Example:
[coord]49.579276566362985,10.9292078018188488[/coord] comes up as <a href="http://maps.google.de/maps?ll=49.579276566362985,10.929207801818848&q=49.579276566362985,10.9292078018188488&t=kbd&z=15" title="Google Maps" rel="nofollow ugc">(49.5792, 10.9292)</a> 
To adjust the link layout of transformed links open wpCoordinates.php in your favorite editor and adjust the following variables:
<ul>
<li><code>$zoom</code>: the zoom level, default is 15. Try some values between 1 and 17 (I guess)</li>
<li><code>$type</code>: map type, i.e. m for map, k for a satellite image, h for hybride (satellite image with street names, etc.), p for terrain</li>
<li><code>$url</code>: URL scheme, replace .de with .com for an english version of Google Maps. DON’T forget %LAT% and %LONG%</li>
</ul>

wpCoordinates

wpCoordinates replaces coordinates between a [coord] tag with a link to Google Maps.

Simple Google Maps vs wpCoordinates