qrevo

You can easily insert Google Maps into your posts with this plugin. 
PHP5 required.

Easy Map Creator

Easily insert Google Maps into your posts with this plugin.

mschwar

Google Maps made Simple by WP-G-Mappity
WPGMappity allows you to easily insert Google Maps into your posts. No XML or JavaScript needed, building a Google Map is done completely in a WYSIWYG form inside your blog.
Versions 0.5 and above use version 3 of the Google Maps API. For you this means:
<ul>
<li>No API key needed</li>
<li>New features</li>
<li>Fast downloads: visitors to your blog only download one extra file from Google – nothing from you.</li>
</ul>
Features include:
<ul>
<li>Markers and custom icons</li>
<li>Routing</li>
<li>Map Controls</li>
<li>Completely customizable size and alignment</li>
</ul>
Project Home, full instructions, and help: <a href="http://matthewschwartz.me/wordpress/wpgmappity/" rel="nofollow ugc">http://matthewschwartz.me/wordpress/wpgmappity/</a>

Google Maps made Simple

Point, Click, Map. Build and insert Google Maps just as easily as you insert images.  All WYSIWYG: no JavaScript, no XML, no coding at all.

Easy Map Creator vs Google Maps made Simple