Ubuntu/Kubuntu (All since 5.10)
Net Ubuntu 6.06
Debian GNU/Linux (3.1 and 4.0)
Fedora Core 5
FreeBSD
DesktopBSD
Damn Small Linux (3.1 I think)

These ones didn't work with my setup:
openSUSE (An older version when it was just SUSE, didn't work)
Mandriva (Wouldn't boot)
PCLinuxOS (Wouldn't boot)

I'm sure I've tried a few others.
I'll try Gentoo and others once I get a PSU for my old box.