Read this whole piece. The line below may be my favorite single thing I have seen written about the iPad.
The iPad isn’t the future of computing; it’s a replacement for computing.
So imagine, say, an iPad Twitter client in horizontal mode. You could have a split view with a list of tweets running down the left. On the right, you could have a web view for reading web pages linked from tweets. Rather than sliding over and replacing the tweet list, they could exist side-by-side. And then a popover could provide an interface for switching between different accounts.
Drool.
