For those who didn't download the update early this morning it's proving difficult to even download it. When I tried to purchase the update for an iPod Touch I received the following error (about 50 times over the course of a few hours).
Apple was aware of the problem, as is evidenced by the email I received from their support team saying "The new update software 2.0 released today '07/11/08' because of this our server is busy and not everyone is able to connect to download." The support email also reassured me that I would "be able to download this shortly."
Apparently their definition of shortly is a little different than most. I've stopped getting errors trying to download my iPod update, but it's still not downloading anything. That's using the links from the Apple webpage. iTunes is now telling me that I already have the most recent version.
As I've been writing this I see that Engadget has been told by AT&T the activation servers are back up, but my iPod update problems continue.