Medical and Health search engines

Medical and Health

PubMed  — The U.S. National Library of Medicine contains over 16 million citations from MEDLINE and other life science journals going back to the 1950s. Contains links to full-text articles and external resources. Supposed to be the best damn resource for medical out there.
National Institute for Health Research Archive — http://www.nihr.ac.uk/Pages/NIHRArchive.aspx Database of ongoing or completed projects funded by the British  NHS.
National Institutes of Health — Encyclopedia of health topics. More of a kindof-deep-web resource, as Google has this indexed.
American Hospital Directory — Index of US hospital information.
Globalhealthfacts.org — Searchable world health information, by country, disease, condition, program, or demographic. Quickly lay out the conditions in a country.
Centers for Disease Control and Prevention Data and Statistics — Statistical health information according to the CDC. Not true deep web, but useful.
New England Journal of Medicine  (commercial) — A Leading medical journal with full text past issues available online. Commericial, but you can access most for free.