Google update the Google map for Android again, the latest version is 5.7, it is the third update Google released in the last 4 month, in this 5.7 version, moving, resizing and rotating maps become more smoothly.
Download Map Area is added in the lab function, from now on you can download the map data where you are going to travel before you start the trip. How to download the map area? simply move to the target area, press on the screen, select download map area on the menu, then you can view that area without Internet connection.
Google Map v5.7 Download link: https://market.android.com/details?id=com.google.android.apps.maps
I think the Download Map Area is a great feature, as the Vector map data feature, which is updated in the 5.0 version. It is more useful then the map caching.