This blog is for peer-reviewers and about peer review. Here we provide information and news about the peer-review process at Nature Publishing Group journals. We also debate the general topic of peer-review, and warmly welcome your feedback and comments. We answer questions about peer review; give guidance about how to peer-review for our journals; and provide a discussion forum for policy and other matters concerning peer-review. This blog also contains the Nature peer review debate which took place during 2006.