Ninja Gaiden Sigma

GameSpot
News, previews, images, videos, links, and a forum.
http://www.gamespot.com/ps3/action/ninjagaidensigma/

GameSpy
Preview, news, and screenshots.
http://ps3.gamespy.com/playstation-3/ninja-gaiden-sigma/

GameStats
Videos, screenshots, article links, and a message board.
http://www.gamestats.com/objects/856/856529/

IGN
Screenshots, videos, previews, news, and a message board.
http://ps3.ign.com/objects/856/856529.html

1UP
News, previews, images, videos, and links.
http://www.1up.com/do/gameOverview?cId=3153721

PSX Extreme
Preview, by Arnold Katayev: "The biggest addition to Sigma will be Rachel as a full-fledged playable character. Team Ninja emphasizes that a lot of the new content found in Sigma will be when you're playing Rachel's segments." <small>(March 20, 2007)</small>
http://www.psxextreme.com/ps3-previews/59.html