This site provides access to free full text journals. The titles included are quality controlled scientific journals. Search by journal title or by the subject "Health Sciences."
"Loansome Doc allows users to order full-text copies of articles from a local medical library (local fees and delivery methods may vary). Users must register to use this service."
This site provides free online access to peer-reviewed original research articles and essays. Each article includes a synopsis written for the general public. PLoS Medicine includes a Patient Summary of each article.