This beta was enough for me to decide to renew my Dev account and put on my iPad. Two things I wanted were the folders for apps and the unified inbox in mail. As I said the other day this update keeps everything that was great about the iPad and adds to it.
It is like spending most of your life sitting in really great seats at a baseball game, but those seats are still cramped and plastic. Then one day your seats get uograded (for free) to slightly wider and fully padded seats. That is the difference between 3.2 and 4.2 on the iPad – life just gets a little better with it and you begin to think ‘this is the life’.