I think it makes more sense as one big book. I know I've been commenting on authors in both groups, and if all those comments are included, it will get weird, because either I'd be commenting on articles not in my book, or there'd be comments from someone not in their book.

As far as recording an audio book, would each author record their own articles? I do plenty of recordings, and it's not that hard to record something, but to get a clean recording with no breathing or pops, is very time consuming.