Because exif data is always recorded, you can look at the pictures you have already taken with the app. It's also integrated into the Pictures hub, showing up as an application in the main panorama view, but also available under the 'apps...' menu option whenever you are looking at a picture.
From the directory listing:
- Read Exif data from the picture
- Run app from the Picture Hub
- Show location of the picture
- Live Tile support
- Fast app resume and Fast app switching
- Support all WP8 resolutions
- Support Large Tiles
- Share image details by email
- Support light/dark theme
You can download the ad-supported app direct from the Windows Store.