Swift: What you want already exists - see, for example, http://farha.com/GMAP/ or http://www.macosxhints.com/article.php?story=20050208234638329.
There are probably others - try this Google search: http://www.google.com/search?rls=en&q=%22address+book%22+%22google+maps%22
Multimap for Address Book
get maps for Address Book entries
Version: 2.1