Neoseeker

Offers previews, cheats, screen shots, links, FAQs and a discussion board.
http://www.neoseeker.com/Games/Products/PS2/finalfantasyx/index.html

IGN

Offers game information, news, preview, and review.
http://ps2.ign.com/objects/014/014008.html

Final Fantasy X

Squaresoft's official site, with character profiles, battle system information, world and features. [Flash required]
http://www.square-enix-usa.com/games/FFX/

Wikipedia - Final Fantasy X

Wikipedia's free encyclopedia entry for the tenth installment in the series.
http://en.wikipedia.org/wiki/Final_Fantasy_X

Gamespy

Game information and cheats.
http://ps2.gamespy.com/playstation-2/final-fantasy-x