Boarding.fr is just what I need! While you are stranded at the airport simply do the following:
Boarding is fully optimized for a mobile usage. You just have to tweet #boarding along with the airport code to get in touch with the service You’ll get a reply with the list of the other users in the same airport in the last hours.
It then lists you and tells you who else is there at that time! Brilliant and almost like using Brightkite location services I so highly recommend.
Humorously they have a Google mashup on their homepage showing travelers at airports all over the world. Quite a cool tool for the avid traveler like myself (@IdoNotes). The last 100 tweets show on their page at a time.