"TRIP (Turning Resource into Practice), is a meta-search engine that cross searches 61 health sites including some key evidence based sources e.g.: ACP Journal Club, Bandolier, Cochrane Database of Systematic Reviews, DARE, Effective Health Care Bulletins, Effectiveness Matters, & National Institute for Clinical Excellence (NICE). Provided on the Web by CeReS, the Centre for Research Support which supports research in primary care in Wales." www.tripdatabase.com

OMNI
Searchable gateway to evaluated Internet resources in medicine, biomedicine, allied health, health management and related topics. This is probably the best place to start if you are searching for new sites.
http://omni.ac.uk
Netting the Evidence
SCHARR links to sources of EBP on the internet
http://www.shef.ac.uk/~scharr/ir/netting
Trawling the Net
SCHARR guide to free health databases on the internet
http://www.shef.ac.uk/~scharr/ir/trawling.html
National Research Register (NRR)
Register of ongoing and recently completed research projects, funded by or of interest to the UK NHS
http://www.doh.gov.uk/nrr.htm
Clinical Governance Resource Pack
Links to Organisations, Publications, Journals, Training, Clinical Guidelines, Risk Management, Quality Measurement).
http://www.shef.ac.uk/uni/projects/wrp/clingov.html
NICE - The National Institute for Clinical Excellence.
http://www.nice.org.uk

Searching for guidelines - a check list of evidenced based guidelines.

Trials that changed practice
http://www.hsc.usf.edu/~bdjulbeg/oncology/practice-change.htm

Dermatlas. Aimed at health care professionals, parents, and patients - high quality dermatology images on the World Wide Web, also includes an online Dermatology Quiz at http://162.129.72.40/derm/quiz.cfm that allows trainees to test their diagnostic skills.

The National Electronic Library for Health Programme

http://www.nhs.uk/nelh/

heppell.net