Once it's shipped, they give you a tracking link.
FWIW, I ordered my iPod the second day; it shipped on the second of May, with an initial ETA of the 6th. This kept slipping, until when I checked it this morning it estimated the 9th, having just passed through a second transit hub.
However, I got it about an hour ago. Go figure.
Very nice; not 100% convinced by the solid-state scroll wheel yet, but this is a *lot* smaller than the original 5 gig unit. very slight LCD screen colouration at the top, nothing to complain about. Love it.
I got the 15 gigger, through the Apple edu store, in the UK.