You know, I've had Google Earth on my desktop for a few months now. I think I originally downloaded it to check it out, took a play for a few minutes, thought it was stupid and then forgot about it. A few months later I was chatting with a friend and he said something like "Yea, I was playing with Google Maps for a few hours today" and I was like : "huh?". Yet a few months more went by until today and I don't know why I fired it up, but I've been playing with it for a few hours now and I finally get it. This thing is pretty fricken amazing! I went to the Pyramids, I saw the Eiffel Tower, I found my house, I looked over Europe and Russia and Japan and flew in and over Bagdad. I just can't stop looking at stuff. And I've been doing it by using my mouse. Just scolling back with my mouse wheel and flying along, connecting locations like I was neo in the Matrix.
If you haven't tried this thing, you should. If you haven't spent an hour playing with it, you haven't had that "wow" moment. In that case I advise you play with it some more.