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.

rampantlogic

Geopost is a WordPress plugin based on Google Maps that let’s you specify a location for each post and generate an embedded map containing a marker for each post that has been assigned a location. Clicking on these markers will link you to the corresponding post. The map can be inserted into any post or page using the shortcode [geopost]. To set the location for a post, enter a search string in the Geopost metabox in the post’s admin page and press ‘Search’. If a location is recognized, a map will appear for you to confirm the result. Clicking on the marker icon in the editor window map rotates through different color icons.

Geopost

Uses Google Maps API to create a map containing markers for posts based on individually assigned geocoded locations.

wpCoordinates vs Geopost