Online Map Help

With Google maps you can set the centre of the map and its zoom level programmatically. You can also ask google maps to set the zoom level so that it is optimised for the set of points on the map.

Here's some rough code, assume that there's an array of points to add to the map - pts:

Code:

// Create a "group" for the points we will be adding
var bounds=new GLatLngBounds();
for(i = 0; i < pts.length; i++)
{
  bounds.extend(new GLatLng(pts[i].lat, pts[i].lon));
}
// Get Google to figure out how much to zoom the map
map.setZoom(map.getBoundsZoomLevel(bounds));
// And tell it where to centre it.
map.setCenter(new GLatLng(area.lat, area.lon));

I'm not sure what you mean by "reviews", do you mean "views"? I.e. road, satellite, hybrid? If you want to add overlays of local authority areas then you will have to create these yourself - check the google maps documentation.