Google Earth

I recently read an article at summitpost.org about using GPS units and Google Earth. I have played around with google earth a little bit but always got annoyed with bad resolution of the pictures. After reading this article by Travis_ from SummitPost I have a completely new found affection for the possibilities of this free program. What a great addition this could be for my web site! Now if only I had a GPS!
I have been drawing routes in manaully on National Geographics Topo software but have always thought that it is far from correct as I tend to have a shaky hand, especially with a mouse. Plus, the Topo edition that I have is not in 3D. Google Earth allows for you to tilt the image for the best effect and gives you great 3D images of your route and the surrounding peaks. Some areas are still bad resolution but hey, it's free!
If anybody else has more information on the uses of Google Earth and GPS please share. For instance, if you are familiar with GPS systems what are the good brands and what features should buyers look for? Does Google Earth track miles and altitude traveled? Share your knowledge! What do you use your GPS for?
Here is a more basic Google Earth article as well.