Congrats trekkie! Sorry you got shipped so late, though it was technically on time or so. It's a super Mac and you'll love it; I can't add to the praise you've seen heaped on it here and elsewhere.
I decided to generally not use the Setup Assistant, because I wanted to clean up a bit after collecting three years of stuff on my iBook. So, I move over things as I remember them, which can be a PITA, but it also tells me what I can delete from the iBook to free up space on the relatively small (40 GB) hard drive. I did end up using the assistant to move my wife's account to the iMac, because neither I nor she knows everything that's in her account!
LIke I said before, once you get it, you'll forget the wait. And you'll sit there, looking at the thing, thinking, "this computer is more than I know what to do with!" 😉