Yeah, I was also accepted to Georgetown but I haven't heard a peep from them beyond the short acceptance and an enrollment form. Were you emailed about the funding or did they mention it in your letter?
It is tough, Georgetown is my first choice but unless they provide something it isn't going to be possible for me to go. It is strange though, their average class size the last few is rather small (9) and according to their site they are suppose offer fellowships in addition to 6-7 TA positions but who knows what that means.
In addition, it is questionable to mail an enrollment form without at least confirming some of the details on funding. All in all, it is a bit baffling.