Also regarding the Princeton grade deflation issue. It appears that grading has gotten a bit easier at Princeton between 1990-2000. However the mean GPA appears to be trending downward again after 2008 (from 3.36 in 2000 down to 3.28 in 2008). Source: http://www.gradeinflation.com/Princeton.html
Duke on the other hand, has had a period of steady upward swing in mean GPA. During the same period 2000-2008 if you were at Duke, the mean GPA rose from 3.33 to 3.44. http://www.gradeinflation.com/Duke.html
As you probably already know, getting a high GPA is critical to success when applying to med school.