The Cochrane Library of Systematic Reviews is published quarterly. Issue three for 2004 of the library was published in July 2004. The Cochrane Library now contains 3559 complete reviews and protocols of reviews. It also contains one-page summaries of systematic reviews published in the general (non-Cochrane) medical literature. In addition there are citations of randomized controlled trials, methodology reviews, the Cochrane methodology register and the health technology assessment database. This edition of the Library contains the results of an extensive search for randomized controlled trials (RCTs) on EMBASE. The latest library contains 75 new reviews, five of which are considered relevant to practitioners in pain and palliative care. References are published in the same format as the citation for Cochrane reviews.