“Pinning messages in mid-air, using the location’s Global Positioning System (GPS) reference, could become the next craze in communications. The messages are not actually kept in the air: they’re stored on an Internet page. But that page’s Web address is linked to coordinates on the Earth’s surface, rather than a person or organisation.

As you move about, a GPS receiver in your mobile phone or PDA will check to see if a message has been posted on the website for that particular spot. If you’re in luck a snippet of info-left as text or a voice recording by someone who passed there previously-will pop up on your screen or be whispered into your earpiece.”

New Scientist | Mobile Phones | Write here, write now

see also:

• Annotate Space
• Peter Merholz on the subject, with links to AnnotateSpace and of course, Fiona Raby’s Work.
• Tony Dunne and Fiona Raby’s FLIRT