Nature is introducing the "blind refereeing" process, i.e. the referees of a manuscript are not made aware of the identity of the authors. Will this improve the objectivity of a refereeing process, avoiding or minimizing biases? I am not so sure, because for an expert in the field it is easy to recognize the identity of the (main) author or the reviewer may be already aware of the work because of private communications.
I have an alternative idea. The comments of each referee should be published, anonimously, as appendix to the paper. In this way, referees will probably be discouraged from revealing their identity so explicitely (as it often occurs) and will be more careful with the comments because everybody may read what they write. Moreover the editors' decisions will have to be more balanced, because everyone may read the comments received from the referees.