[Wildgoose]

I had an HP200LX (still have actually) and it was fabulously useful - a full CGA DOS computer that ran on 2 AA batteries for 40 hours and fitted in your pocket.

It had XIP (Execute-in-Place) applications built into the ROM which ran instantly, including Lotus 1-2-3.

I kept all my finances on the (built-in) Pocket Quicken and organised my Calendar, Address Books, Writing, you name it. Even printing was a doddle - I just pointed its Infra-Red port at the Office Laser Printer and it printed quite happily.

I used it as an e-reader, turning it on its side like a book, before e-readers even existed.

It was so fabulously useful I find it hard to believe that they weren't more widely used!