owencutajar

The GeoWidget plugin displays a map in your sidebar that can be used to show where you live. You can use it to show any point on the map; where you work, where your idol lives or even where you want to go on holiday. The plugin works both as a widget or as a stand-alone component you can add to your sidebar.
Most information at: http://www.u-g-h.com/index.php/wordpress-plugins/wordpress-plugin-geowidget/

Geo Widget

Add a map to your sidebar. Select a map view from your Admin console. Widget friendly. Uses Microsoft Live Maps.

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.

Geo Widget vs LibraFire PinPoints