Mortal Kombat 4 EXTREME
Featuring: News, moves, downloads, interviews, mailbag, links, archives, MP3s

Mortal Kombat Nightmares
Featuring: Kodes, moves list, fatalities, FAQ, 2^nd fatalities, Mythologies, other MK related stuff

Mortal Kombat Information Center
Featuring: Discussion boards, chat, guestbook, news, FAQs

JBomb's MK Realm
Featuring: News, moves & fatalities, links, guestbook, pics

The Black Dragon Organization
Featuring: Petition page, image archive (MK I, II, & III), moves list (MK I thru IV), News, links, endings, storyline

Mortal Kombat 4 (official site)
Featuring: News, gallery, links, moves

The Realm of Mortal Kombat
Featuring: News, moves, features, pics

NOOB.COM
Featuring: Official news, Mortak Kombat Mythologies, "Cover stories"

The Lin Kuei Headquarters
Featuring: News, FAQs, MK4, moves, writings, guestbook, links, writings

Baraka's MK5 Cavern
Featuring: Info, screenshots, pool, links

Arachnid's Underground Lair
Featuring: Moves, fatalities, endings, kombos

Scorpion's Lair
Featuring: Cheats, Movies, Links

Mortal Kombat Dominion
Featuring: A few links & rumors

MK4
Featuring: News, moves, links

njo's Mortal Kombat page
Featuring: Message board, News, Images, Links, Guestbook

Scandia Funland
Featuring: Mortal Kombat 4!

They have version 3!!!

Noob Saibot's Thriller
Featuring: Some links