Nokia has put in place a server where users with Nokia devices can upload maps. Those without Nokia devices are still able to access the maps as well. Nokia Map Loader is an application that plays the third-party in accessing the map server.
Once you have Nokia Map Loader running, it will automatically connect to the Nokia server. Then, an interface where you can select the kind of map you wish to download will be accessible. You will be able to download city indexes and associated voices side-by-side with the maps.
Nokia Map Loader can access older map version for you. There is a comparison tool that can show you which sections of the maps have been updated. Whenever a new map has been downloaded and installed, Nokia Map Loader will keep an installation history for you.