-M3 Questions-

Family Medicine (9 questions)

-M2 Questions-

Gastrointestinal (84 questions)

Endocrine (61 questions)

Reproduction (75 questions)

Musculoskeletal and Integument (73 questions)

Infectious Disease (33 questions)

Hematology (30 questions)

Renal (8 questions)

Behavioral Medicine III (fact list)

Boards (fact list)

-M1 Questions-

Anatomy (70 questions)

Neuroscience (22 questions)

Biochemistry (7 questions)

Immunology (10 questions)

-More Free Study Materials-

NEJM Image Questions - Tough questions, but a great way to boost a USMLE score

USMLE Gold Collection - Great review!  From the University of Utah as a 36 page PDF

Embryology Animations - Questions and animations from Indiana University

Exam Master - free test bank for CU students

www.4tests.com - 60 free USMLE-type questions

www.boardreviewer.com - over 500 questions and USMLE score estimator

http://www.testprepreview.com/usmle_practice.htm - Lots of review questions grouped by system

http://library.med.utah.edu/WebPath/EXAM/MULTORG/EXAMIDX.html - there are about 45 questions for each organ system