This page links to about every imaginable language corpus, so you might find some sources there:
David Lee's Corpus-based Linguistics LINKS
I think concord is interesting, but is there that much to say on collective nouns? Australian English is closer to AmE on this, if my memory of a discussion on the subject serves me, but then is there that much to say on the topic? If you broaden the scope, I think it might be a meatier topic.