Google Rate Places Widget! can be installed on your Android phone's Home Screen, and it automatically searches for places near your location, enabling you to give quick, convenient ratings. To install, from your Home Screen, simply touch Menu > Add > Widgets, and then scroll through the list and select "Rate Places." The widget will appear on your Home Screen, and you can move it around to any pane you'd like.
If you've enabled location services, the widget will use your current location to find places around you that you can rate. The Rate Places widget displays them in a convenient list, sorted by distance.
As soon as you've put down your silverware or signed the bill, and would like to leave a quick rating. After selecting the entry, just press the stars icon on the left side of the widget to provide a quick star rating. If you've a little extra time, press Say More which opens Google Maps and allows to rate individual attributes or write a review of a place: