++ for your great post, vrk! As another finn I just need to nitpick a little on your last examples.

# my $muuttaja = value;
# You say:
muuttujan arvo on value. 
# which in my opinion means more like:
$muuttuja eq value;

# I would change that to
muuttujaan value. 
# Meaning: value to muuttuja.

# Or maybe
muuttujan arvoksi value. 
# Meaning: value to muuttuja's value.

# Or more verbal:
aseta muuttujan arvoksi value.
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We'll there more than one way to say it in finnish too ;) Sorry for post that probably has very little to give to non finnish readers. My first post here anyway.