I am lovin' this program. Anyone else got it? Have you put any of the plugins on yet? ( I got flickr, keyhole and a bunch of 3d models from google earth hacks) It's fun to see the world from afar. I can see the Burning Man Festival in Nevada, then skip over to the Great Pyramid... love it!

I've used it but why is it in sharp focus some places and out of focus in others?

I'd like to try it out, but they don't have a version that will run on a Mac (yet).

What is this google earth thing?

It's a Google program that lets you zoom in places from above, using aerial photography. There is a free version and pay version that provides GPS support. I've just used it a bit, however it is pretty slick. You can download it from the Google site.