From: Mark Mcbride <mark@...>
Date: 2008-11-05T15:16:43+09:00
Subject: Re: Diff for 2 Text Files

You can expand on this approach if you're outputting to an html view 
too:
http://markmcb.com/2008/11/04/ruby-on-rails-diff-text-to-html-ins-and-del/

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