Medscape Medline Search Free searches sponsored by advertisers. The query field requires some knowledge of boolean symbols. Integration with full text articles lends added value. Simple registration and passwording. Knowledge Finder Free trial period after registration.
Handsome interface uses pick lists for fuzzy versus boolean searching and word variants.
Permits natural language queries. Helix Medline Access Free searching for professionals after completion of a registration form. Uses the Silverplatter service. Icon driven intuitive interface. Offers thesaurus searches and advanced features such as synonym matching.