NASA has released their official iPhone app called ‘NASA‘ which provides hell lot of information about NASA projects right on your iPhone/iTouch.
This App shows breif information about their Missions including images and videos. You can also browse all their projects and get all their details. You can also view visible sighting opportunities listed for the International Space Station (ISS) and Space Shuttle.
If you like any images or videos you can directly tweet or share on facebook or email friends straight from the app. This app requires WiFi, 3G or Edge network connection.
This is very handy and powerful app and serve its purpose quite well and above all it is available for free on AppStore.