I learned about photography many years ago in high school, first with a borrowed Pentax K-1000 and then with a Minolta XG-1. As you may recall, the K-1000 was a manual mode camera and the XG-1 had manual and aperture priority (Av) shooting modes. I then went to a Minolta X-700 for many years until very recently. The X-700 had Manual, Av and P modes.
So, since for a long time I used cameras that offered primary manual or Av modes, I find myself shooting in Av mode or manual with my 10D. I tend to think in aperture priority and think about DOF before I think about freezing the action.
So I'm curious what mode you folks primarily use and why?