Magnus Manske, 11/04/2014 00:12:
There's a tool for that:
http://tools.wmflabs.org/wikidata-terminator/index.php
Check the third row ("Top 1000 items with missing articles").
Small wikis still have to use https://meta.wikimedia.org/wiki/List_of_articles_every_Wikipedia_should_have. ;)
Nemo