Haha Lindsay. I too had the "any day now" thing with my daughter - for about 2 weeks or so and then finally got induced 11d past my due date. Unfortunately unless you have basically gone into labour, its all bloody speculation!! They really have no idea.
I'm really not expecting to go early, like not even a little bit. My mother has booked her flights for the 27th Dec, and I reckon she might make this birth too. I also have to factor in the lovely DP who will tell me to close my legs the closer we get to Jan 1st. he wants the first baby born in Vic. Bloody idiot.... he will realise what a BAAAAD idea that is if he has to put up with me 2w over again!
Good luck for you - I hope you are sooner rather than later