Yes, it was available for pre-order on the Apple site. There was a bunch of news about that beginning in the middle of May 2009, if I'm recalling my dates correctly.
I heard that apple stores will open at 8am. I'd still go for AT&T's 7am opening :P Then parade down to the Apple store here and wave my phone a lot. hehehe
Where are all you guys posting from? Which cities do you believe will have the 3G S at Apple stores on launch day? I can't find any information about the phone coming to Canada, and I certainly can't find anything about stores that will have in on launch day. Boo.