I can see this to be very useful, especially for people who do a lot of article readings on newspaper sites, i.e. New York Times, etc … this newspaper has their current articles available for free, but when they are archived, they have a charge to access them.
Because furl archives a copy of the article, it doesn’t really matter if the actual websites archives the article, you will still have it available anyway.
I think this is a great site for anyone to have, because anyone will always have the need to store and/or archive some article, some forum thread , etc…. check it out.