[geon]

The interface on those was more of a barely usable desktop experience, that happened to use a stylus. You could not call it a "touch interface". My brother had a HP Jornada, and while he used through college, it was kind of sucky. It ran Doom, though.

http://www.pocketpcfaq.com/wce/21/jornada680.JPG

[ekianjo]

I disagree. Those devices were very usable but, of course, you needed 2 hands to do anything with them. You could do a lot of stuff with it, and a number of apps were way more advanced than what you see on android and ios nowadays. The finger interface has got much better, but a stylus was way more precise for many purposes. The surface covered by a finger induces great limitations to the interfaces you can create. There's no miracle.