Storing location data rather than querying on each visit will keep your number of calls down now that Google has put a cap on free use of the maps API.
Once you have the latitude or longitude, you can use it with Maps or any other geo plugin or custom application.

With this extension, you'll get the following benefits:

• Installing and configuring it is a breeze.
• Definition of one or more address sets possible.
• Fetches geocoordinates for given address Custom Fields and stores them in Custom Fields for Latitude and Longitude.
• Uses the Google Map JavaScript API for the most accurate geodata.