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The Retina Display of the new iPad makes it great for editing photos, and this app uses a fantastic touch interface to make that as easy as possible. The interface is very intuitive, and the app has tools to judge the editing process from start to finish.
The loupe tool lets you zoom in on specific areas of the photo, and the compare button toggles the before and after view of any editing process.
While iPhoto from Apple is a good editor, Snapseed is even easier to use.