With this plugin by ZeeMaps you can post a customized, interactive Google Map in your WordPress site.
features:
Create a free customized, interactive map
Publish the map on a blog or website
Upload addresses from Google Spreadsheet or CSV file
Customize marker fields for geo search
Highlight regions like states or countries
Create PDF or JPEG images
Create wiki-maps for groups
Plugin homepage: http://www.zeemaps.com/wordpress