Google Maps: Helicopter view.

If you create a map with directions, you can now watch a fly-through of your path, by clicking on the "3D" button.

If you have a fast connection, no worries, but if you don't, you might want to hit the pause button and let Google Maps draw its 3D buildings in, to give a more-realistic view.

It'll be a great tool for letting you preview your travel plans in unfamiliar locations.

Via PCWorld, original source Google LatLong Blog