Centre for Evidence Based Medicine
http://cebm.jr2.ox.ac.uk/

Bandolier
http://www.jr2.ox.ac.uk/bandolier/

Centre for Reviews and Dissemination
http://www.york.ac.uk/inst/crd/

Cochrane Collaboration
http://www.cochrane.de

Health Technology Assessment UK
http://www.hta.nhsweb.nhs.uk/

National Coordinating Centre for Health Technology Assessment (NCCHTA)
http://www.hta.nhsweb.nhs.uk/

National Electronic Library for Health (NeLH)
http://www.nelh.nhs.uk/

National Institute for Clinical Excellence (NICE)
http://www.nice.org.uk/nice-web/

School of Health and Related Research, Sheffield
http://www.shef.ac.uk/~scharr/ir/netting/
http://www.shef.ac.uk/~scharr/ir/nnt.html

Scottish health on the Web: guidelines
http://www.sign.ac.uk

Sumsearch: The Health Centre at Texas University San Antonio
http://sumsearch.uthscsa.edu

TRIP Database: Metasearch Engine
http://www.tripdatabase.com/