OpenStreetMap
Last days I tagged embassies worldwide with ISO 3166-1 alpha-2 country codes (--> Links):
An example, the US Embassy in Berlin:
amenity=embassy
*** country=us ***
addr:city=Berlin
...
Before this OSM had 362 embassies, 320 without correct country code. Now there are 376 embassies and only 7 without correct country codes.
Links:
ISO 3166-1 alpha-2 country codes: http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
Wiki page embassies: http://wiki.openstreetmap.org/index.php/Tag:amenity=embassy
Discussion
Comment from seav on 31 March 2009 at 16:22
Oh, so that's why I see your edits to the embassies in my area. :-)
Any particular reason why you changed the from_country tag to just country?
Comment from Serpens on 1 April 2009 at 09:34
"from_country" was my own proposal...
Much more users used "country" so I changed too. In the end it is technically very simple to change that back but to add ANY country code wasn't that simple (1,5 days for me).