I got this e-mail from UMich MSTP program today. "since we haven't received your list of faculty whose research is interesting to you, should we assume that you no longer are interested in interviewing at the University of Michigan? We want to make the visit as productive as possible; that means coordinating your schedule with the faculty members'. Please let us know as soon as you can." The first sentence of that e-mail sound pretty ominous. My interview there is over 3 weeks away! A polite reminder would have sufficed, but I sent my list earlier and I'm sure evertyhing will be cool. If anyone else is interviewing at UMich, you probably want to send them a list of faculty before you get this. That might go for some other schools too.