Places that contact applicants from FIRST HAND info:
(Sources - people I know who got them, info that programs told me about contact etc)
The list is certainly longer than this, I only listed what I know from first hand info that hasn't been posted (or is different from what has been).
Columbia - calls, "ranked to match" (week after interviews)
Penn - calls, "ranked to match" (week after interviews)
Pitt - calls, top ? (sometime after applicant emails, letters)
HSS - letters, indiciating levels (Amy said "probably" this week, historically end of Jan/beg of Feb)
Harvard - calls, "ranked to match" (close to list due date, historically)
U of Chicago - letters, "highly likely to match" (done)
Remember, competitive programs often don't get the majority of their "top x" (x being number of spots they offer) unless they negotiate (fewer and fewer programs now days). That means that many (sometimes most) people at any given program didn't get a letter/call from that program and are perfectly happy being residents there...
Good luck making your list and detoxing from email and orthogate overload