[wlug] Good distro for old machines

I have a tutor with a problem. He wants to send a whole lot of machines back to his home town in South Africa and has asked me to help. The problem is that most of the machines have 32/64MB RAM and only P2's with very small hard drives. I was wondering if anyone could recommend a distro that would run on these specs and be easy for people who have not touched a computer before. Ideally, it would run XFCE or something that is low on resource usage. I am looking at maybe Puppy, DSL or MepisLite. Cheers Nick