I too did a do-it-yourself post-bac program. I just enrolled at Boise State University as a biology major and chose electives that I thought would help me the most in medical school. So far I've taken the following:
Organic Chemistry
Zoology
Microbiology
Pharmacology
Cell Biology
Histology
Human Physiology
Head and Neck Anatomy
Biochemistry
Genetics
Next semester I'm taking a course entitled "Physiological Basis of Wilderness Medicine" in which we'll learn what is going on in the body when it is harmed by common wilderness injuries, i.e. burns, hypothermia, frostbite, altitude sickness, rashes, etc.
From the feedback I've received in my interviews, these types of courses are really encouraged since they will be directly applicable to medical school, and by doing well, it shows that you'll probably do well when it's covered.