Generating Cache Density Plots
Creating a cache density plot will let you see where the most dense caches of an area are. To do this, you need to export data to a "kml" google earth file. The density plot will be included with it.
You can either create a kml export from the command line using arbitrary search terms, or you can use the GUI by simply running "geoqo".
Then select the pocket query (for example) name you want to export in a density plot, and change the output format to "Google Earth (KML)" and the file name to a .kml ending of your choice.
The next screen will let you set parameters that affect the .kml file. There are a lot, so I suggest starting with the default and working from there.
Then, launch google earth and open the resulting file. The "red" areas will be the areas with the least number of caches in them, and purple will have the most.