Plugin Similar to Microsoft Word "Track Changes"?

I’m looking for a WordPress plugin that will go beyond the existing features of a www.ads-software.com install and allow the same sort of red-lining, in-line commenting, “accept changes,” and side-by-side comparison as Microsoft Word.

This is for helping multiple people collaborating on site content. More specifically, it’s to allow an “editor” to provide a review of a draft of content by any one of a number of writers. Then, the writer should be able to go back in and accept certain changes, respond to in-line comments, and so forth (like in Word.)

I know that I can get a side-by-side comparison of two versions of a post in the default features, but I’d like to do more. Anyone have a recommendation? Thanks!