This is what I used for on-the-go tech in 2003 sitting in a café in Madrid. A Psion 5mx and a brick Nokia mobile phone The Psion had a great form factor that had a keyboard that was just big enough for touch-typing and small enough to fit into a jacket pocket. It also had the wonderful benefit of being distraction-free.
Not forgetting the camera, a Canon Powershot S30. A remarkably pocketable device for the time.