A new camera app, is now available in Android market, which allows for photographs to be "rewound" in case you've mucked up the image. Say for instance your friend is blinking in a shot, with the new app you would be able to "rewind" the image to the point where they weren't and save it.
Check out Slider Cam on Google Play store page: **removed**
(More screenshot available on play store page)
It features a magical "Timeline Lens", designed to capture those “magic moments” that you miss by not hitting the camera shutter quick enough. It allows you to step back in time when you miss a shot, rewind the shots or the sections of photographs and take your pick from the previous seconds worth of frames.