Yeah, nice, but I use an even more obscure PDA. You've probably never heard of it. It's called the Tandy Model 100.
I knew a guy who used one regularly, at least up through the year 2000, primarily for testing serial port hardware he was hacking up.
If someone announced a new version with small updates(e.g. backlit screen) I'd be interested.
Edit: that said it would be competing with tablet + keyboard + battery pack combos now.
As I understand it, the Model 100 was a favorite among journalists. At the time, I was impressed with being able to just turn it on and go. That was also why I liked my Palm Pilot.