The first thing I would do is make sure that every applicant is told instantly about the progress of their application, so they don't have to check Grad Café every 5 minutes to see if the admits have gone out yet.
I'm not sure that this answers anything for you, but I'll share a bit of insight gleaned from a close friend of mine who works in Georgetown's admissions office. Bear in mind this is only guaranteed true in Georgetown's case, but I've got to believe they aren't the only ones who operate like this.
Applicants are generally sorted into tiers. Tier 1 applicants are those with STELLAR credentials, like, 4.0 GPAs from Harvard, perfect GRE scores, etc. They get their acceptance letters first, and fastest. Then there is a lull. The admissions office waits to hear back from those before offering or denying anyone else. If they get a lot of Tier 1-ers to accept their offers, then only a very limited Tier 2 applicants are accepted. Conversely, if half of Tier 1-ers decline admission, that leaves room for plenty-- if not all-- of the Tier 2 applicants. Rinse and repeat this process for Tier 2 versus Tier 3, until eventually all open spots are filled.
Basically, they prioritize applicants, giving the best first chance to decline/accept and working their way down. Obviously if you have a 2.0 GPA you're simply rejected outright. There are, of course, universal standards. But assuming you're a semi-decent candidate, the above explanation is how it works.
So if you haven't heard anything yet, that isn't a good OR bad thing. What it means, in my (limited) experience, is that you have not been rejected outright. Which is good. You must have decent credentials. But it also means you haven't been accepted outright along with the Tier 1 applicants, either. It's entirely probable you're in Tier 2 or something and your fate will depend, at least partly, on how many Tier 1 applicants accept.
I hope this was coherent. Try not to stress over it, in either case-- you'll be all right no matter what happens, as there's always next year if the worst transpires, and that one year can make a huge difference. You've done all you could for now.
