This is a screenshot image of the old Apple.com website (pre iPad)..
.. and this is the new Apple.com Website (post iPad)
The pre-iPad and post-iPad versions of the Apple website are pretty similar except for the one minor change.
Apple has dropped the software downloads section from their website’s main menu bar and replaced it with the iPad. You can still access the Software Downloads page from its original location – apple.com/downloads – but it is no longer one-click away from all other Apple pages.
Why? I think it was more of a design limitation for Apple – they couldn’t fit any more items in the current version of the menu bar and the iPad was too important a device to be left out of the main navigation.