Evidence Updates, a collaboration between BMJ Group and McMaster University's Health Information Research Unit, offers an email alerting system and a searchable database of articles that are pre-screened for quality and given a clinical relevancy rating.
The NNT, Number-Needed-to-Treat, web site includes therapy reviews, diagnostic (likelihood ratio) reviews, and risk assessments created by the NNT Group.
From the Centre for Reviews and Dissemination - An international database of prospectively registered systematic reviews in health and social care.
From the University of Kansas - Simultaneously searches MEDLINE, DARE, the National Guideline Clearinghouse, and other resources.
A meta-search engine of many EBM resources, including the Cochrane Library, e-journals, practice guidelines, e-textbooks, and PubMed.