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Google Earth: FREE With Google Earth for iPad, you can fly to far corners of the planet with just the swipe of a finger. Explore the same global satellite and aerial imagery available in the desktop version of Google Earth, including high-resolution imagery for over half of the world's population and a third of the world's land mass. You can swipe with two fingers to adjust your view to see mountainous terrain.

GeoWalk HD: $2.99 AU We are all used to the idea that encyclopedias are pretty boring and usually too overloaded with information, that's why we decided to squeeze the most essential and exciting info about our planet into a brief, informative and illustrative 3D Fact Book to explore the world in a playful way.

National Geographic World Atlas: $1.99 AU National Geographic World Atlas HD utilizes the highest resolution images, providing you detail, accuracy, and artistic beauty normally found in wall maps and bound atlases. Preloaded with 3 different styles of world maps with an internet connection, you can continue zooming through continent-level maps into Bing maps - close enough to see your home!

Share Wi-Fi access. I wrote this up a while back, but it's pretty great: Wifi Joiner lets you create and post a QR code that embeds access info for your wireless network. This is great for home networks, coffee shops, and plenty of other places. For the moment, though, it's Android-only.

Get reminders as you leave the house. If you use an online task manager like Google Tasks or Remember The Milk, it's easy to create a tag called "Leaving the House," "Leaving Work," etc., then create a QR code directing to that page. Post it at the door, or anywhere else you'll be sure to see it when leaving, then scan it for reminders of things you need to do before leaving. At the very least, you won't forget your phone anymore! Have you come up with some awesome uses for QR codes? Let us know.