Re: Cambridge Z88?
One of the most useful things I ever had was a Psion 3a organiser. Simple easy to use database, word processor, diary, and had a BASIC-like language to let you make custom apps. Some internal memory, along with plug in memory packs. Oh, and it ran for ages off two AA cells, and had a little CR20xx inside to keep things going whilst the batteries were changed. Not to mention a small but remarkably nice keyboard.