Link Location to Information
This is the key!
Whatever tool might be used. It is a wonderful key to link information to a specific location. Information that can locked to a location. When I visit the location physically, it would be ideal if my portable device would recognize my area and location relevant information would become available.
Now, if when I visit a location virtually, via Google Maps or BingMaps or any mapping tool I can see information relevant to that location. This is already happening. Another way of looking at this is that information can be geotagged. Just like photo's or video are now geotagged. Even a blogpost can now be geotagged (See draft.blogger.com)