Tracking edits in RSS feeds

I love NetNewsWire's ability to show the differences between two edits of the same entry in an RSS feed. Above is an example where you can see that CNet editors rewrote two stories excerpts. Credits for this feature go to "teenage writer, coder, and hacker" Aaron Swartz.
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So now we'll be able to see bloggers insulting each other and erasing the record. Or, lying through their teeth and then telling the truth -- if that concept isn't too post-modern.
Now, if only AP had an RSS feed.