I received my email from Apple about 2 hours ago that mine has shipped. Fedex tracking shows the shipping info was sent to them at 6:09 am our local time, and that it was picked up at 9:48pm local time in China.
Mine is a 32gb black AT&T model
I'm expecting that it will show Hong Kong later today or tomorrow and that it will probably arrive in anchorage the next day. I suppose that if this first stage goes quickly, there is an outside chance of a Saturday delivery. My Smart cover delivery will be 4 days, and I'm hoping that the iPad is the same.
however....
Delivery is set for March 22nd, which is also my birthday. Hoping that they are running a little faster than that, but it will be a nice birthday if not.