Star Walk - 5 Stars Astronomy Guide (iOS) app for $0.99

Star Walk enables you to point your iPhone at the sky and see what stars, constellations, and satellites you are looking at in real-time. Please note, you will need a 3GS/4/4th gen iPod Touch for motion tracking, otherwise this app will be just a beautiful info-packed time-sensitive interactive star atlas that allows you to set your location manually to give you the most accurate picture.