Persian City Directory: Games: Video Games: Recreation: Board Games: Chess: Handheld: Online Chess Kingdoms:

Web Directory - Games: Video Games: Recreation: Board Games: Chess: Handheld: Online Chess Kingdoms

See also:

GameSpot - Reviews, news, previews, images, videos, links, and a forum.
GameSpy - Provides information, screenshots, and a review.
GameZone - Review, by Natalie Romano: "If you’ve been dreaming of an interesting chess game to take on the go, Online Chess Kingdoms for the PSP might be right up your alley." [Score: 7 out of 10]
IGN - Video, screenshots, review, preview, news, and a message board.