Bungie.net: Official developer's site. Features game background, screen shots, wallpapers, and FAQ.
Oni - The Greatest Game Ever?: Fan site offering weapons descriptions, moves, and screen shots.
Oni Central: News, links to previews, multimedia archives, and forums.
Oni Online: News, game information and guides, cheat codes, screenshots, downloads, and multimedia.
Rockstar Games: Official publisher's site. Includes game background, character biographies, weapon descriptions, screen shots, and movies. [Flash Required]
The Shapeshifter: Devoted to the characters of the game, including how to become them and use their special moves.