Chris Anderson links to an interesting experiment:

The scientific journal Nature is conducting a fascinating experiment in “open peer review”, which it describes this way:

In Nature’s peer review trial, lasting for three months, authors can choose to have their submissions posted on a preprint server for open comments, in parallel with the conventional peer review process. Anyone in the field may then post comments, provided they are prepared to identify themselves. Once the usual confidential peer review process is complete, the public ‘open peer review’ process will be closed. Nature will report on the results after the trial period is over.