Two words: Google Earth. (click on the title)
I'd been playing around with google maps for several months, and I was bummed that there wasn't a google earth for the Mac, and I even wrote them and said, "hey we want google earth, too!"
Google Earth (for Mac) has probably been around for a few months, but we've been pretty busy at work since January, and the last thing I wanted to do at home was to sit in front of the computer, but now that the semester is winding down. . .