|--==> "DSG" == David S Goldberg <David> writes:

  DSG> So the only difference between r and R is really a visual cue to you
  DSG> as to whether you read or just marked an article in the current
  DSG> session.

Although you can score articles differently based on these marks...

(setq gnus-default-adaptive-score-alist
      '((gnus-del-mark (subject -1))
        (gnus-read-mark (from 1) (subject 3))))

In this example, articles that you mark with `d' will end up having
the score for its subject lowered by 1.  And any article that you
actually read will have the score for the author increased by 1 and
the subject increased by 3.

Obviously for this to work you need to be using "adaptive scoring".

-- 
|---<Steve Youngs>---------------<GnuPG KeyID: A94B3003>---|
|              Ashes to ashes, dust to dust.               |
|      The proof of the pudding, is under the crust.       |
|------------------------------<sryoungs@bigpond.net.au>---|