Interesting info on forensics. The main thing is of course the gps info stored in the image by your camera.
http://fotoforensics.com/tutorial-meta.php
I installed exiv2 in my system (a command line tool) to look at metadata of my old photos. exiv2 can remove this metadata. Strangely, while my photos have gps version info, there are no coordinates. I have yet to see a photo with coordinates. Of course I could have turned that off in my camera and forgotten it...
