Here’s another person who has fitted computers onto their treadmill to make a walking office. In the blog the owner of the Treadputer notes that he also uses the office while running:

We’ve had the Treadputer operational for about 45 days and I love it. I had high expectations for walking, but low expectations for running. It turns out that the Treadputer is highly functional when I’m running, which enables me to do some of my longer runs during the day while I’m on a call rather than having to get up at 5am to get them in before the day starts.

I think I need to create a whole new category for a different kind of ‘mobile office’ here.