I know this is a double post, but an idea I’ve had bouncing around my brain (or should I say, Brainz 
) for several months is DataBrainz. the idea is similar to Wikidata, insomuch as it would collect data about different entities among the different Brainz; social links, name, and most importantly replacing links to all other Brainz with a single central link. for example, how we’ve got BookBrainz editions and MusicBrainz releases for the same audiobook. the same with many BookBrainz authors and MusicBrainz artists.
it might not be super useful at the moment, as there’s only two main databases of things (BookBrainz and MusicBrainz), meaning we can just link them both together. however, if we start getting more Brainz off the ground, it could get pretty crazy having a BookBrainz author, MusicBrainz artist, ArtBrainz artist, VideoBrainz director, and a GameBrainz developer for the same person and hoping whoever added each knows how to find and link all of them
perhaps it could also show data from all the various Brainz projects? all a persons’/groups’ release groups/edition groups/etc.? just an idea~
that or we could try and convince the Wikidata people to allow entries for more obscure entities? (only mostly kidding)