Writing Messages In Empty Space With GPS

meiocyte writes: "This New Scientist story about leaving messages in empty space seems very cool. You upload a message (or perhaps a picture, audio clip, etc.), it gets tagged with your GPS coordinates, and then anyone else who goes there gets to see/hear it. Every GPS-resolvable parcel of empty space will have its own web site!" Combine this with user-forums, and restaurant ratings could take on a whole new dimension. Update: 01/20 23:28 GMT by T : Oops -- looks like I duped Michael. Sorry.