PubMed and its post-publication peer review tool, PubMed Commons | On Science Blogs

"The first priority needs to be to encourage post-publication peer review and to raise its profile, as PubMed Commons will try to do. Post-pub review is not just navel-gazing or a way to provide disgruntled researchers with a place to vent. It’s one crucial long-term step toward combing the crap out of the scientific literature and making it more trustworthy."