GNU/Linux/Unix Distributors Web Sites - the major english language versions anyhow, typing the international set would cramp my fingers!
Armed Linux - made to run on DOS (Win 3.x/95/98).
BestLinux
Caldera OpenLinux - Major Distro. They were big to begin with, and now they own SCO UNIX.
ChainSaw Linux
Connectiva
Corel Linux - Major Distro.
Coyote Linux
Debian GNU/Linux - Major Distro.
DragonLinux
easyLinux
Elfstone Linux
Embedded Distributions - Not A version of Linux, but a site that hosts a very long list of small, embedded distribution/versions of Linux.
FreeBSD - although not using the Linux kernel, FreeBSD is a GNU/Unix system that runs on various hardware platforms.
Hewlett Packard - although not a Linux distributor (yet, LSO?), they are a UNIX OS & Hardware co. that supports GNU and GNOME.
Icepack Linux
Immunix
Jurix Linux
L13Plus
LinuxOne
LinuxOS
LinuxPPC - Linux for Power Mac, IBM and Motorola PReP and CHRP, Amiga, and various PowerPC (SMP) models and certain IBM RS/6000 computers.
Linux Antarctica
Linux by Libranet
Linux Mandrake - Major Distro.
LinuxWare
LoopLinux - made to run on DOS (Win 3.x/95/98).
LuteLinux
MaxOS&trade
MkLinux - Linux for Macintosh hardware.
PhatLinux - run Linux on a Windows 95/98 partition.
Pizzabox - hardware/server using a modified Linux in a "Disk-On-Chip" (Flash HDD) that fits in a Pizzabox.
RedHat Linux - Major Distro.
Redmond Linux
RockLinux
RT-Linux
Slackware Linux - Major Distro.
Stampede Linux
Storm Linux 2000
Sun Microsystems - although not Linux, they are a UNIX OS & Hardware co. that supports GNU and GNOME.
S.u.S.E. Linux - Major Distro.
Trustix Secure Linux - High security Linux for Servers.
TurboLinux - Major Distro.
WholeLinux - features an install tool that gets it on in 4 minutes.
WinLinux2000 - run Linux on a Windows 95/98 partition.
Yellow Dog Linux - Best rated MAC Linux, runs on most Macs.
Yggdrasil Linux
Linux Related Web Sites (how-tos, as well as news and products)
RedHat's Getting Started Guide