One of the better star map applications.
iPhone version:
https://itunes.apple.com/au/app/id295430577?mt=8
Over 8 million users! Winner of Apple Design Award 2010
Star Walk is the most beautiful stargazing app you’ve ever seen on a mobile device. It will become your go-to interactive astro guide to the night sky, following your every movement in real-time and allowing you to explore over 200, 000 celestial bodies with extensive information about stars and constellations that you find.
60+ clicks but only 3 votes :(