OK, this may sound a little wacky, but with the emergence of the SFE GPS Datalogger and the various cameras available here, it might not be too hard to do:
Create a device to stamp GPS data into the EXIF meta-data of a digital photo. This would be incredibly useful for adding real pictures to GPS points/routes in apps like Google Earth/Yahoo Maps/Windows Live Local, etc.
I think we’ll actually see the day where a vacation photolog that isn’t linked to maps with your comments and GPS route overlaid will seem quite old fashioned.
Would certainly be a boon for real estate agents. Click the picture with a WiFi enabled GPS camera and it gets instantly posted to a website for all to see, complete with neighborhood info and pictures of other nearby houses, sites, etc.