Dead or Alive 4 - Official site with downloads, information, and screenshots. - http://www.microsoft.com/games/doa4/default.asp
Heroes of Gaming - [9.2/10] Reviewed by: Richard S. Stites. "Needless to say Dead or Alive 4 has a little something for every fighting fan out there..." Includes screenshots and cheats. - http://www.heroesofgaming.com/videogames/about129.html
FilePlanet - Offers trailers and gameplay footage. - http://www.fileplanet.com/101560/0/section/Dead-or-Alive-4
Xbox Solution - Preview, by Infinity: "Regardless of if you're a fighting fan or not, you really should be slobbering buckets in anticipation." - http://www.xboxsolution.com/article2348.html