This site provides a list generator that lists Wikidata items that link to only one language version of a Wikipedia page. This helps to find Wikipedia pages where the corresponding pages in other languages actually exist, but are not linked to the page.
Data was extracted from the data dump of wikidata.org, which can be found at dumps.wikimedia.org. Current data is based on the dump of 26 February 2014. See also Wikidata:Database download on Wikidata.
If you have any comments contact me at my talk page on Wikidata: User talk:Sanyi4.