To put in my two cents worth. I have been using palmtops or organizers since the first Sharp unit that had a querty keyboard. I still carry some paper with me a lot of the time. I do not consider this a failure of the organizer. Many times you need something to confer over or to scrawl on.
Nothing beats paper and pen, yet.
I was using their smaller binder for my IIIc but not any more. I am sorely tempted by the ipaq. I think that it's great that there are options available for everybody. Adding the extra convenience of being able to carry a full size pen or stylus while also having a pad of paper for those times when you need it - I think that products such as this will always have a place in certain consumers hearts. As far as finding an iPAQ, they should be getting easier to find, now that the 3670 is coming out, you might even be able to pay simple retail for one without some of the crazy mark-ups we all saw over the last year.