My daily Twittermail summary earlier in the week included the following interesting notion:
Waiting at the airport? Tweet #boarding along with your airport code to find other stranded Twitter travelers
While this is quite a neat idea, the French developer of what's been dubbed the Boarding Project (the site provides a summary of boarding activity on a map) has been a bit over-keen with the promotion. A dedicated bot is so busy promoting the concept that every search for a #boarding tag finds lots of copies of that promo message as well as actual relevant posts. Nonetheless, it's worth pursuing if you've got time to kill airside -- just remember to include and search for the relevant three-letter airport code (such as SYD) as well.