Medical Mnemonics.com- A free, non-profit, online searchable database of medical mnemonics to help remember the important details.

MedScape - Excellent free site that has an E-Mail newsletter as well.  This site has a multitude of case reviews, quizzes, journal reviews and summaries, articles on topics in modern medicine and much, much more.

MedicalStudent.com- A digital library of authoritative medical information for all students of medicine.

Rx.com - Excellent database of nearly all clinically used drugs.  This site has information on class, mechanism of action, contraindications, general patient information and much more.

WebPath- This electronic resource includes over 1900 images along with text, tutorials, laboratory exercises, and examination items for self-assessment that demonstrate gross and microscopic pathologic findings associated with human disease conditions.

HealthAnswers.com- A comprehensive, educational and award-winning interactive healthcare Web site for consumers and professionals alike.

StudentDoctor.net - A bulletin board / forum for medical students.