Permanence is an important part of the newspaper UI.  By permanence, I mean like the pile of real world newspapers that gathers around our houses over a week until the garbage day comes around.  Memories of what I read or scanned within last seven days are fresh in my mind and there is certain comfort in knowing that I can get at it and read it in same context.

In contrast, other aggregator UIs lets news articles flow by or gather out of context.  Real world newspapers have a certain hard-to-describe orientating effect on its readers and I feel that its important to duplicate that effect in newspaper UI.  If you know of some HCI reseach done in this area, I would appreciate knowing about them.