Robin Good: TargetMap is a free web service that allows you to create and customize professional-looking data-maps with any country or area in the world.
Maps created with TargetMap (satellite, physical, hybrid, etc:) can utilize excel-formatted data, can be color-coded and customized manually, or specific data can be input in them.
The user can also leverage existing public maps for the creation and customization of new ones.
Final maps can be exported as images, embedded in your web site or blog or shared directly to Facebook and Twitter.
Three options are available for your maps: shareable, not shareable and private/business. The first two options are free and the third one starts at $49/month.
Free shareable maps do not support the zip code field.
Find out more: http://www.targetmap.com/