I'm wanting to view the CQ Zones in Google Earth, and I understand that a KML file will allow me to do so. Is there a place where I can get a KML file that shows all of the CQ Zones?
There is not any such listing, as the definitions for CQ zones are a bit ambiguous. The official definitions can be found at the CQ Magazine WAZ award definition. Areas like the ocean aren't covered, otherwise it's a fairly simple geography lookup to get the areas defined.
This may be helpful. Specifically the link titled "Map of QTH Locators for whole World". I was able to successfully determine my grid square using it and it covers the globe.