AHRQ: Clinical Information http://www.ahrq.gov/clinic/
Clinical information on evidence-based practice, clinical guidelines, medical effectiveness, pharmaceutical therapy, new technology, screening and preventive services, outcomes research, and the National Guideline Clearinghouse.
Entrez-PubMed http://www.ncbi.nlm.nih.gov/entrez/query.fcgi
National Library of Medicine's search service provides access to over 10 million citations in Medline, PreMedline, and other related databases, with links to participating online journals.
Evidence-based Decision Making http://www.evidencebased.net/
The primary purpose of this site is to support health care decision making. Includes summarized key articles, through the use of a critical appraisal journal club, application of EBDM principles and links to related sites.