I applied to a bunch of MD/PhD programs all over the country (Emory, Duke, Stanford, JHU, Tulane, Harvard, Yale, Tufts, UChicago, UPenn). I think that I will need to visit the schools to figure out a top choice, though.
On ~ 10/2 I received a call from a lady in the MSTP office at UChicago to invite me to have dinner with an MD/PhD Professor who will be in my area. I don't think that this is an actual 'interview,' though I'm not quite sure what to make of it. The guy does really interesting research, so it should be fun to talk with him. Also, at about the same time that I heard from UChicago, I was invited to interview at Duke.
Ironically, Duke and UChicago happened to be the last two secondaries that I completed but were the first--and so far only--schools to contact me for interviews.
All of the information on the SDN has been great--thanks!