Here is the link to the 2006 Yale Waitlist Thread:
http://forums.studentdoctor.net/showthread.php?t=269631&highlight=Yale+Waitlist+2006
The short answer is that it looks a little crazy - the waitlist letter didn't seem to give any indication of rank, but they initially said that once all of the waitlist letters had been returned, they would come up with a tiered waitlist. Some people got emails from Richard Silverman saying that they were in a special highly highly ranked waitlist and were invited to revist weekend. The rest had to call Yale on a special day to talk with Mr. Silverman -- it seemed like the intention of this was to find out rank, but I'm not sure that that happened for everyone...
Some people from this thread actually did get in though, so here's to hoping!
😳