Damn Small Linux http://www.damnsmalllinux.org/
Is designed for older hardware it is debian/knoppix based. Check out their forum for partitioning and other set up info.
http://damnsmalllinux.org/cgi-bin/fo...=ST;f=5;t=2734

I don't have any personal experiance with it but feather linux http://featherlinux.berlios.de/ might also be of interest.

Good luck and you might want to search http://www.linuxquestions.org/questions/search.php?s=
if you have other installation questions. I think that they might have a DSL forum there too.