Would the WikiData community be interested in linking together Wikidata pages with Freebase entities? I've proposed a new property to link the two datasets here:
http://www.wikidata.org/wiki/Wikidata:Property_proposal/all#Freebase_identif...
Freebase already has interwiki links for many entities so it wouldn't be too hard to automatically determine the corresponding Wikidata pages. This would allow people to mash up both datasets and cross-reference facts more easily.