i am not sure of the mechanics of the particular event i read about, but it was called picture hunt.
i could imagine someone heading to far off lands, closing their navigator and snapping a screen shot. maybe the pic would need to be altered (windows paint can erase the gps) if you cant close the navigation box). first person to take and post their own shot at the same coordinates wins.
what the prizes would be, i don't know, just an idea.
it's like hide and seek without the person having to stand there, would give people not online at that time a chance to win, and (most importantly, wink, wink) "force" people to come to the website to see the photos!!! who knows, they may actually start using the forum for other things.
ps - the screen shots of opti vs. the world boss WERE SPECTACULARLY AWSOME!!! and i loved the group photo at the end.