Milestone Letters from Physical Review Letters
In connection with the 50th anniversary celebration of Physical Review Letters, a series of milestone letters are being selected, briefly described, and posted each week during 2008. "Milestone letters have made long-lived contributions to physics, either by announcing significant discoveries, or by initiating new areas of research. Many of them report on work that was later recognized with a Nobel Prize for one or more of the authors." An RSS feed for the milestone letters is available