Deter Theft with GPS
Modern mobile devices (phones, PDAs, laptops, etc) could deter theft by all but the most hardened criminal, and it would only require the simplest of modifications to the firmware in many of the devices already on sale.
Geo-Tagged Photos
For the last few weeks I’ve been testing out some geo-tagging software on my camera. The concept is fairly simple, whenever I take a photo, the built-in GPS works out where I am and records this metadata within the photo.