not to burst your bubble GeekyJeff but I also ordered a G5 2.0 GHz DP the day of the keynote and, so far, Apple has pre-charged my account 3 times over the course of the time I've been waiting.
What Apple actually does with orders that take such a long time to ship (like the G5), is pre-charge the money every few weeks (is it a month?) to make sure the order is still "active", so to speak. So, it may or may not mean that they are ready to ship it... though I do hope they do.
I'd say that until the money is actually withdrawn from your account, there is no real assurance that the machine will be shipping soon.
Hope I'm wrong...
F