It was an interesting experiment that started on June, 1 in the Nature office: a first trial of of open peer review. Of the 10,000 papers received every year, 6,000 are immediately rejected and eventually 700 published after peer review. The result of the trial, however, is disappointing:

We sent out a total of 1,369 papers for review during the trial period. The authors of 71 (or 5%) of these agreed to their papers being displayed for open comment. Of the displayed papers, 33 received no comments, while 38 (54%) received a total of 92 technical comments.

The trial provoked some web traffic with approx. 800 page views/day. Welcome back to the altruism thread, the discussion may be followed at their blog, yea, yea.