RedHat and Debian are the two main version of Linux although there are many many many others out there.
Distro Watch is a site that keeps track of new distributions as they come out.
Wikipedia list of Linux distributions
Another Wikipedia list of Linux distributions
The folks at Kannery were nice enough to E-mail me new links,
Kannery linux desktop out of Israel
or
ISO Mirror for Kannery
Locust Mesh AP Linux
Kix
Pilot Linux
Sunrise Linux
SPB-Linux
GNUMafia
DaNIX
O2 Linux
HRID
Salvare
Navaho Linux
DebToo
evelin
Ken-Zoe
Trinity Rescue Kit
DietLinux
The BBLCD Toolkit
CEMF Linux
Viper Linux
Gentooish Security Toolkit i386 LiveCD
Console Linux
BioBrew Linux
Lunatix GNU/Linux
Dappix
Echelonlinux
nihonLinux
AnNyung
Adelie Linux
Knoppel
Generations Linux
OpenGET
Ehad
ZipSpeak
IndLinux
Slo-Tech GNU/Linux
PROTOS
Ignalum Linux
Orangecell.org Linux
Litrux
Rocks Cluster Distributions
Routix
Fermi Linux
Dave/Dina
FRUSTIX
Good-Day GNU/Linux
LITRIX
KnoppIT
Cryptux
Darkstar Linux
Phrealon Linux
Antlinux
Rox OS
Ed's Xbox Debian GNU/Linux
De2
TupiServer Linux
slavix
Kazit
Dizinha Linux
DNA Linux
KlusTriX
GIS Knoppix
ESWare LinuX from Spain
Hispafuentes From Spain
JBLinux from Norway
Stampede Linux
Yoper From New Zealand
DamnSmall Linux 50 MegaBytes
AbulÉdu From France
GeeXboX
rtlinux real-time kernel
K12LTSP K12 (Linux Terminal Server Project) based on RedHat Fedora Linux working with Schools
Recovery Is Possible (RIP) is a small, specialized Linux distribution, Aternate site
iPodLinux , uC linux on Apple iPOD
Slackintosh from Switzerland a port of Slackware Linux to the PowerPC (Macintosh) processor architecture.
Yggdrasil Linux a now long dead distro, but was one of the main originals.
Other Linux'es and stuff I still need to research
Adamantix ; ADIOS ; AGNULA ; Aleader ; AL-AMLUG ; ALT ; Ankur Bangla ; Arabbix ; Arch ; Ares ; Ark ; Astaro ; Augustux ; Aurora ; Aurox ; AUSTRUMI ; Ayrsoft ; Bayanihan ;
BearOps ; BEERnix ; Berry ; Biadix ; Bioknoppix ; blackPanther ; BlackRhino ; BLAG ; Blin ; Bluewall ; Bonzai ; Boten ; BrlSpeak ; Buffalo ; Burapha ; ByzantineOS ; Caixa Mágica ; cAos ; CDlinux ; Censornet ;
Chinese 2000 ; ClarkConnect ; CLE ; clusterKNOPPIX ; College ; Componentized ; Condorux ; Conectiva ; Cool ; Core ; Cosix ; CPUBuilders ; CRUX ; Damn Small ; Debian ; Deep-Water ; Defender ; Definity ; DeLi ;
Devil ; Drinou ; Dyne:bolic ; e-smith ; Eagle ; eduKnoppix ; EduLinux ; eLearnix ; ELX ; EnGarde ; ESware ; EvilEntity ; Feather ; Fedora ; FIRE ; Flonix ; Freeduc ; Freepia ; Gelecek ;
Gentoox ; Gibraltar ; Gnoppix ; GNUstep ; gnuLinEx ; GoboLinux ; Guadalinex ; Hakin9 ; Hancom ; Happy Mac ; Haydar ; HispaFuentes ; Holon ; Icepack ; IDMS ; Immunix ; Impi ; INSERT ; IPCop ;
JoLinux ; Jollix ; JUSIX ; Kalango ; KANOTIX ; Kinneret ; kmLinux ; knopILS ; KnoppiXMAME ; Knoppix STD ; KnoppMyth ; KRUD ; Kurumin ; L.A.S ; LFS ; LGIS ; Libranet ; LIIS ;
Lineox ; Linpus ; LinuxConsole ; Linuxin ; LinuxTLE ; Linux XP ; LiveCD Router ; Livux ; LNX-BBC ; Lonix ; Lorma ; Luinux ; Lunar ; Magic ; Mandows ; Media Lab ; Medialinux ;
MEPIS ; MIKO GNYO ; Miracle ; MIZI ; Morphix ; MoviX ; MSC.Linux ; MUMi ; Murix ; Nasgaïa ; Netwosix ; NordisKnoppix ; NuxOne ; OGo Knoppix ; O-Net ; OEone ; Omoikane ; Onebase ; OpenDesktop ; OpenNA ;
Openwall ; Oralux ; Overclockix ; PCLinuxOS ; Peanut ; Penguin Sleuth ; Pequelin ; Phayoune ; PHP Sol ; Pingwinek ; Plamo ; Plan-B ; PLD ; Polar Bear ; Puppy ; QiLinux ; Quantian ; Red Flag ;
ROCK ; ROOT ; RPM Live ; Rubyx ; RUNT ; SCI.Linux ; Securepoint ; SENTINIX ; Sentry Firewall ; Shabdix ; Shark ; Skolelinux ;
Slix ; SLAX ; SmoothWall ; SoL ; SOT ;
Source Mage ; Soyombo ; stresslinux ; STUX ; SULIX ; Sun JDS ; SystemRescue ; TA ; Tao ; Tech ; TFM ; Thiz ; Tilix ; TPM ; uOS ; UserLinux ;
Vector ; Vine ; ViruX ; vnlinuxCD ; Voodoo ; White Box ; WinBi ; WOMP! ; WOW ; X-evian ; Xteam ; Yoper ; YourESale ; Zeus ; Zopix ;
DLX ; JAMD ; JBLinux ; LDP ; LRs ; LTT ; LinuxGuide ;
Owl ; PLD ; RDF ; ROCK ; RPM ; RedHat.com ; adios ; alfalinux ; alsa ; applications ;
archlinux ; arklinux ; astaro ; aurox ; baslinux ; bastille linux ;
benchmark ; blinux ; coda ; collegelinux ; coollinux ; coredistro ; crux ;
decp ; devil linux ; dlhp ; doslinux ; dragonlinux ; dynebolic ; e;smith ; embedded ; enlightenment ; etlinux ; featerlinux ; featherlinux ;
floppyfw ; freeduc ; freesoftware.com ; freeswan ; freshmeat ; gazette ; portage ; ggi ; gibraltar ; gnome.org ; gnu ; gnu;darwin ; gobolinux ;
hal91 ; haydar ; ibiblio ; icepack linux ; insert ; ipcop ; isos ; jux ; k12ltsp ; kmLinux ; knoppix ; knoppix;std ; las ; lasg ; lasg; ldp ;
lg ; linuxconf ; looplinux ; lormalinux ; lunar ; medialinux ; metalab ; mojonation ; morphix ; mulinux ; niemi ; onebase ; opennalinux ; openwall ; oralux ; pclinuxos ; pcmcia ; perf ; pocket linux ;
routehat ; rpm.org ; runt ; sf ; sf;sorted ; siag ; slax ; smalllinux ; smoothwall ; sol ; sol ; sotlinux ;
sourcemage ; stewart ; liusersguide ; sunsite ; tawie ; tcltk ; tinyX ; tinylinux ; tomsrtbt ; topologi; tut ; utils ; vectorlinux ; xbox linux ; xutils ; Adios ; Arklinux ; Aurox ; Icepack
Distros at http://distro.ibiblio.org/pub/linux/distributions/
1diskx; altlinux; amigolinux; annvix; apodio; archlinux; arco-debian; arklinux; aurora; auroxlinux; baslinux; bayanihan; beatrix; beehive; beernix; blag; buffalo; caoslinux; ccuxlinux; clienux; clusterix; cobind; collegelinux; conectiva; contrib; damnsmall; debian; debianpure; demolinux; dragonlinux; dynebolic; e-smith; eadem; eloop; engarde; esware; feather; featherweight; fedora; fnord; foresight; frustix; ftosx; generations; gentoo; gibraltar; giotto; goblinx; gobolinux; h3knix; hakin9live; hdlnx; hiddenlinux; ignalum; immunix; iris; jacl; jamd; jolinux; jollix; k12ltsp; kalango; knoppix-std; knoppix; knoppixmame; kurumin; lamppix; linare; linespa; linux-router; looplinux; lormalinux; lvr; lycoris; magiclinux; magnux; mandrake; mandriva; mepis; minislack; monkey; munjoy; mygeos; navyn; nfsroot; onebase; openna; opensuse; openwall; orangecell; peanut; phlak; phpsollive; physictools; pingwinek; puppylinux; resala; rootlinux; rpath; slack390; slackware; slampp; slax; slimlinux; small-linux; smeserver; smoothwall; snootix; sol; sorcerer; sotlinux; sourcemage; spinix; startcom; suse; texstar; tinysofa; trinux; trustix; uos; vectorlinux; vn-x; vnlinuxcd; voodoolinux; weblinux; winlinux; yellowdog; yes; zenlinux; zenwalk;
Linux Stolen Code Cute commentorial about SCO Law Suite claming AT&T code ended up in Linux. This Shit just never ends.