Drs. Jane M Young and Michael J Solomon from the Surgical Outcomes Research Centre (SOuRCe) at the Royal Prince Alfred Hospital in New South Wales, Australia, have published a paper in the latest Nature Clinical Practice Gastroenterology & Hepatology on how to properly read and assess a research article.
Full paper is available for free here: How to critically appraise an article Nature Clinical Practice Gastroenterology & Hepatology (2009) 6, 82-91