Meta Sites
Institute of Algorithmic Medicine - Tons of medical calculators
University of Florida's Med Info - Choose one of the years from the left side of the screen (e.g., "COM First Year") and enjoy to postings and links
eMedicine - Lots of articles about various diseases
Merck Manual
PubMed - Journal articles housed at NIH
Science Direct - Journal database
The Mother of all Resources

Anatomy
Direct Anatomy - Browsable images of the human body
UMICH Anatomy - Excellent resource with animations, videos, and practice quizzes.
University of Michigan's Lab Manual
Get Body Smart - A really good anatomy site with lots of information about the human body. Contains some practice questions.
Arkansas Anatomy Tables - Very detailed tables
The Anatomy Lesson - A minitext for anatomical structures.
Wheeless' Textbook of Orthopaedics - Another minitext/table
Anatomy Table
Gray's Anatomy
UWashington Dept. of Radiology Upper Extremity Atlas
Learn the Brachial Plexus in 5 minutes or less
Eye Simulation page - practice your knowledge of extraocular muscles and nerves.
Videos of Berkeley's undergraduate human anatomy
Disection videos

Neuroanatomy/Neuroscience
Neuroanatomy review
Interactive Atlases - Click on Brain or Neuro syllabus; this site has a wonderful atlas
Neuroscience Tutorial
UToronto's Neuro Notes - This program is awesome to visualize in 3-D stuctures like the internal capsule. Download Functional Neuroanatomy and Functional Neuroanatomy update to function properly.
Whole Brain Atlas
Salaman's Neuroanatomy Atlas
The Human Brain Atlas - From Michigan State
Essential Neurologic Exam
Essential Neurological Findings

Pathology
WebPath - tutorials and and online path exams.
Heme/Onc Morpholgies

PDA Software
Family Practice PDA - A collection of lots of programs and information for the Palm and PocketPC.
ePocrates - The most popular drug guide (Palm, Pocket PC)
Med Calc (Palm)
Freeware Palm - Loads of free software (Palm)
Mobile PDR (Palm, Pocket PC) - You must register with pdr.net first
Monthly Prescribing Reference - Another drug guide (Pocket PC)
Merck Manual (Palm, Pocket PC)
Meister Med - reference books (Palm)
List of misc. medical programs - from UC Davis, this list seems to be a bit outdated
Doctor's gadgets - The SDN of medical PDAs
Palmdoc - Medical PDA blog
Lexi-Comp - Drug Database ($)
PEPID - Lots of integrated software (Palm, Windows, $$)
Unbound Medicine - Has the 5 minute Clinical Consult, among other titles ($)

Misc/Humor
MedTerms Medical Dictionary
Set of Study Guides
Medical Mnemonics
MIT's OpenCourseWare - MIT puts their lecture materials online
Scut Monkey
Massive Attack: Special Cases, Male - A fun music video with some in vitro fertilization and development. A good distraction from studying.
Massive Attack: Special Cases, Female - Same as above, but through the female perspective.