Is unique Work identifiers as use case?

I came across this post
http://booksearch.blogspot.com/2010/08/books-of-world-stand-up-and-be-counte
d.html

And it made me think the is having a unique work identifies (which seemingly
will be handed google Tome cluster Ids) a use case we should worry about?

Cheers Tod
-- 
''You begin saving the world by saving one man at a time; all else is
grandiose romanticism or politics.''
   Charles Bukowski