The gallery will group photos based on where there were taken given the GPS data. To turn off the "geo-tagging" feature:
1. Open camera
2. press menu soft key
3. tap settings
4. scroll down to Store location and change to "no"
Im not sure if it will apply this retro-actively so it may still list the address.
Thanks! Is there a app where the picture gallery would change automatically and serve as your wallpaper. It gets frustating when you want to change your wallpaper and you have to crop. Any ideas?