The article opens by quoting the NYTimes claiming the iPad's keyboard is "abysmal for typing anything over 140 characters", yet fails to address this point anywhere. Is touch as fast and accurate as a keyboard and mouse?
I'm a keyboard snob; My 'daily drivers' are two HHKB Pro IIs (one at home, one at work) on which I average about ~ 110 WPM, maybe 120 on a good day. On my iPad, I can get up to about half that without trying too hard - which I think is actually pretty good given the lack of any tactile feedback. While certainly suboptimal, I don't consider it to be anything like "abysmal".
Even if it's possible to type fast on an on-screen keyboard, there are still a fair number of problems with it -- (1) requires the display to be in position which is good for typing, but not so good for viewing, (2) takes up half the screen for the keyboard, (3) is simply less pleasant to use than a real keyboard.