Deli Linux's link is now http://www.delilinux.org/

Perhaps there should be a mention of Kmandla's blog? Arguably one of the most informative, and regularly updated on doing stuff with old computers.

http://kmandla.wordpress.com/

Hopefully not starting a distro war, but for the under 700mb catagory, I believe AntiX might be better than Fluxbuntu? AFAIK Fluxbuntu is not activity developed anymore (And 7.10 which it's based on will EOL by Jaunty). AntiX is an established project, still actively developed and is similiar in many ways, (Both uses fluxbox as main WM, ready access to debian/ubuntu repos)