If Google and Medline had a baby, it would be SearchMedica.

"SearchMedica is easily navigable. The home page has a clean, simple appearance with one main search box underneath a toolbar offering features to search within the entire site (All of Medicine) or within one of ten specific areas (Cancer/Hemic, Cardiovascular, Diabetes/Endocrine, Infectious, Mental/Nervous System, Musculoskeletal, Pediatric, Practice Management, Radiology, and Respiratory). Immediately below the search box are three Advanced Options: Recommended medical sites and Prioritize results by publication date are the defaults; the third search option is titled The entire Web. Users also may refine results by categories including Clinical Trials, Evidence-based Articles, Patient Education, and Practical Articles/News. An improvement to SearchMedica would be the separation of Practical Articles and News; users could then use News to track current medical events. SearchMedica offers many additional features, such as the option of adding the Search Box to blogs and Web pages. Registration is free and offers additional benefits, such as a weekly tips newsletter." from Choice, April 2009