Keyhole NV is for NVidia cards, and Keyhole LT is for everyone else. Download, install, setup a free 14-day passport.
Then, drool. Wish you could have it for longer than fourteen days. Explore the features by exploring the world. Locations have information, are hot setup for google searches... ::drool::
For those of you that have read Snow Crash, remember how Hiro had a subscription to Earth? Guess what- this is it.
::goes back to playing with his new toy::