No, unfortunately he has not used anything else so far. Listening to music and looking at beautiful paintings are the only ways he uses the iPad.
What a great way to use a computer. I'm truly fascinated by the way technology-averse people actually use technology. I had a hippie roommate that I'd constantly catch just listening to ambient music and spinning around the world on Google Earth on his laptop. A pretty enlightening contrast to my usual non-work mix of social networking and news blurb reading.