I just came across Locr, a geotagging and photo hosting tool not unlike Flickr (which I’m not going to review just this minute) but which does have one of the cleverest implementations yet I’ve seen of a Turing Test to keep out automated sign-ups: Asking users to read a Google Maps tile and identify the feature in the middle.
Genius. And it now comes with an uploader for S60 phones like my Nokia N95.
Nice idea.
But I wonder how long would it take for a spambot to 1) get the coordinates from the displayed map 2) do the reverse geocoding 3) select the right city ;)