To people worried about asking the department where they are on the WL...
I'm on the waitlist now for my top school, and the letter I received (via email) seemed to strongly discourage asking for more information about one's chances of admittance: "The Department has a waiting list because we truly have no idea how many students will accept or decline our offer. But as such, I unfortunately have no basis at this time to tell you the probability of your being accepted into the program; it depends solely on if and how much space becomes available and this changes from year to year."
I was still desperate for information because acceptance would mean moving from TX to NY, but I didn't want to create a bad relationship with the school by pestering them. So what I did was write the GPD who sent the letter to say that I was still very interested in the program and am eager to hear from him once a position becomes available. THEN I wrote the professor there that I like to tell him that I'm on the waiting list and "although I don't currently know my position on the list," I am looking forward to the possibility of meeting him.
I would recommend the same to anybody. I dropped enough hints that would allow them to provide me more information if possible, but I didn't ask too many annoying questions. The professor ended up mentioning my email to the GPD, and the GPD wrote me a response which basically indicated that they still couldn't tell me anything: "Thank you for responding. Indeed, this is valuable information for us as we go forward. Again, I unfortunately do not know what the future holds, but will let you know as soon as I possibly can." Basically I was able to politely indicate my high interest in the school and the awkward refusal to answer my questions was totally avoided.