Malcolm

An interactive map can be added to your website by adding a single shortcode. The location the map can be specified either by shortcode attribute or URL parameters. Other (optional) values can be added to specify the scale of the map, screen size in pixels, and the map type.
Features Summary
<ul>
<li>Provides a WP wrapper for the Microsoft Bing Maps AJAX Control</li>
<li>Adds an interactive map to your WordPress Post or Page</li>
<li>Location specified in shortcode attribute</li>
<li>Image size can be specified by optional shortcode attribute</li>
<li>Map scale can be specified by optional shortcode attribute</li>
<li>Displays Ordnance Survey Mapping (GB locale only)</li>
<li>Shortcode Attributes can be replaced by URL Parameters</li>
<li>Requires a Microsoft Account and Bing Maps Key</li>
</ul>

MapView for Bing Maps

The MapView for Bing Maps plugin adds an interactive map(s) to your Wordpress Page or Post, using the Bing Maps AJAX Control.

LibraFire

LibraFire PinPoints plugin is a great tool for image mapping functionality with a really easy to use drag and drop ability.
1) You can set default settings for future plugin use. 
2) You can add unlimited number of markers on image per post. 
3) You can choose the size, color, background caption color, font size, opacity of the caption text (dot). 
4) You can choose on which post type the PinPoints control will show up.

LibraFire PinPoints

LF PinPoints is a simple drag and drop image mapping plugin with a caption functionality.

MapView for Bing Maps vs LibraFire PinPoints