Distro for a single use machine

[Linux on Back2Go]

Hi I was wondering if any recommendations for a Distro for a single use 
machine.
I have an slimline IBM that was running 98 something on a network, most 
bullet proof thing we ever had. I was wanting it to run GRAMPS and maybe 
a very thin wordprocessor and nothing else but a keyboard, mouse and 
monitor. So I can hand it around the family to do GRAMPS things with it,
Any suggestions, where to find Distro etc, I will be in Chch next few 
days too if that helps, cheers Kevin   also on 0272497326 but text is best