COPAC- access to some of the largest university research libraries in the UK and Ireland
PubMED.com - a database of articles with abstracts from biomedical journals
NHS Evidence Health Information Resources (formerly National Electronic Library for Health)
National Primary Care Research Centre and Development Centre (NPCRDC)
National Research Register - a database of all ongoing or recently completed R&D projects in receipt of funding from the NHS
NHS Centre for Reviews and Dissemination (CRD)
The Nuffield Centre for International Health and Development
intute - closed in July 2011 - a catalogue of research websites