Google Maps for Mobile 3.2 now allows users to view a number of different layers, including traffic, local search results, Latitude friend locations and Wikipedia. You can also view your own My Maps content as a layer.
Multiple layers can be viewed on the map at the same. Search results have also been improved. Maps for Mobile now displays many more search results, shown as small red dots on the map.
You can learn more about Google Maps for Mobile 3.2 at the the Google Mobile Blog.
Via: Google LatLong: Lots of layers in Google Maps for mobile 3.2