Lots of data is recorded in photos every time you take a picture with a modern digital camera (EXIF data). Stuff like; make, model, aperture, shutter speed, ISO etc. Nowadays, it's possible to add GPS information as well. This information is available in programs like Adobe Lightroom and Apple Aperture.
Unfortunately, the recorded information might get lost if you use graphics software to manipulate the photos. For example, I take 5 photos and blend them into one for a panoramic photo or an HDR photo. The result can be stunning, but mostly, the original EXIF information is gone. In these situations I copy the information using jhead (exiftool is an alternative) from one of the original images and place this in the final (manipulated) image. Downside is that this is kinda disrupting for my 'workflow', because is done by the command line.
It would be nice if e.g. Lightroom had a context menu of copying the EXIF information (this is possible for other metadata in the photos), and pasting it in the new photo.
Some might say that this might not be very ethical because the data is from another image, but then again, there are tools already available for doing this. Even though these aren't very user friendly. Perhaps a small suggestion for the developers.....