From the NASA Images blog at http://nasaimages.wordpress.com/2009/11/04/nasa-images-iphone-app/
“Check out the free NASA Images iPhone App, a window to the content available on nasaimages.org. With the app you can access the entire NASA Images library from your iPhone along with the metadata for each image, video, and animation.
“The NASA Images app delivers the following features:
-Search and browse media from nasaimages.org
-View images with interactive zoom (zoom images by double taps)
-Watch NASA programs and mission footage
-Send email with URLs of favorites
“The NASA Images iPhone App was developed by Hajime Hirose from Tomute Software. Hirose has developed other iPhone Apps such as NASA Checker, and Whitehouse Checker. If you like the app make sure to rate it or write a review!”