I've had 2 iMacs delivered to me both within a week, I can't say I've had a problem w/ them getting to me fast, but have had a problem getting to me in one piece, well with the Original one anyway.
I ordered the first one 17" w/ Wireless kybd/Mouse 5 minutes after the store was up after the Keynote on 1/10. The Order shipped on a Friday 1/13, and was Delivered on MLK day 1/16 with a cracked screen.
Called Apple, They sent me return labels, had it picked up on 1/18 and a Replacement was Ordered.
The Replacement was shipped on 1/21 and delivered to me this morning 1/24, with no problems at all.
Unless a lot of people are having problems with theirs, because they told me Replacement orders get pushed to the head of the line.
Hope you all get yours soon, You'll love it once you do!