Hi, SunElec!
Not only did I use Google Earth for my home's latitude and longitude, I also used it for site planning for my last three dishes! What I did was to simply create permanent markers for my home, for each of the ~10 satellites I was interested in on the equator, and a "South" marker that simply contained my longitude, with a latitude of 0 degrees. I then used the Ruler...Path function to draw lines from my home to each satellite, as well as to (true) "South". Via the lines to the satellites (plus that handy atan() function in Calculator), I could verify exactly what satellites I'd be able to pick up, and what the line of sight would be to each.
The best piece, however, was instead of having to use a compass to get the motorized dish pointed properly, and having to screw with approximations of magnetic deviation, I just zoomed in to the view of my home with the line to "South" plotted on it, noted where that line crossed the roof of the neighbor's house in the Google Earth satellite image, walked outside, and trivially set the azimuth in minutes. I think my "eyeballed" estimate was less than 1 degree - easy enough when you've got such a clear target to aim for.
A great tool, indeed!
Cheers!
P.S.: As a fascinating tidbit, I can actually see where my original dish is in the Google Earth imagery -- and it's only a Ku dish!!!. This sure makes pointing things easy!