He used a combination of Goodreader and Pages for content creation work. I'm going with Goodreader and Polaris Office myself. Having just recently finished a Masters degree before buying the iPad (it was a graduation gift to myself), I got to say -- wish I bought it earlier while in the throws of an intense student phase of my career.
How well does Polaris Office work? I read about in last night in my January of Maclife and was thinking of downloading it so I could edit word and excel files from my iPad.