Whoops, I owe an apology to the Swedes: the Swedish Wikipedia is bigger than the Icelandic, even if you take the number of speakers into account.
I also wanted to say that I agree that gerard Meijssen's point is very important: The wikipedias are indeed culture-bearers for their respective populations, and not just for humanity as a whole!
The Esperanto wikipedia is a good example of just this. You'll find plenty of articles there with information which might be considered vanity, or at least not encyclopedic enough, in other languages' wikipedias.
Verdlanco