It's hard to believe that it's been four years since I first wrote about the idea of an info pad. I thought for sure we'd have one by now, but to my immense frustration it's still not here. We're gradually getting closer, though, so I think this would be a good time to revisit the idea.
As I explained in my original post on the subject (link), the info pad is a small tablet computer designed not for consuming content but for managing the information needs of a knowledge worker. It's a business tool, not an entertainment device. It has a stylus, so you can take notes and sketch on it, but it also acts as an extended memory, letting you access your old files, messages, contacts, and other important documents.
Mike Rohde drew a picture that captured the idea well (link):