Are you looking for simple tool to view maps offline on PC? GMap Catcher is a free offline maps viewer program. It can download CloudMade, OpenStreetMap or Google Map tiles automatically.
It displays downloaded map titles in easy user interface for neat offline browsing. This program does not depend on Google Maps javascripts, thus allowing it to work evern if Google changes backend scripting. Besides downloading maps, you can search and zoom on specific areas on any map.