Google Docs and Track Changes…

So you say you don't use Google Docs because you must have the "Track Changes" feature of Microsoft Word. Or maybe it's Mail Merge you can't live without. In typical Google fashion, they have taken those concepts to a whole new level (not to mention Revision History, Notifications, Bookmarks, etc.):

Think of the educational and administrative implications of these advancements - it's mind-boggling!