A really interesting postcard I received last year. Not really so much the picture on it, but the story behind it and the reason for the card. Things like this make me miss Finland. :P
It seems fairly safe to say that Postcrossing is still pretty big in Finland when they now have a Postcrossing Association (Suomen Postcrossing-yhdistys). They have their own website (as far as I can tell, it's only in Finnish, though) and they seem fairly active. I'm pretty sure I'd be a member, too, if I still lived in Finland.
This card was sent from the association's constituent meeting, but it seems to have a been a meet-up as well as the card was signed by quite a few people.