Hey,
I was going through this program on differential diagnosis. It is pretty cool. They have all the DD's that should come to your mind when you see the doorway information. The best part it is interactive and you have to think of all the possible history and PE that a particular DD should have. This really helps me to write the patient note section under the History and PE column. I think it is the 4th step of their online video program at Target USMLE. http://www.targetusmle.com/newtarget/login.php