Final Fantasy X Ultimania Guide
Not coming to the states, unfortunately, but it may be the best guide to the game around.
The set is in two parts, each priced at 1,400 yen. Scenario Ultimania describes the story, sub-quests, world map, towns, dungeons, and everything else that can be experienced and explored. It also includes a complete guide to all Blitzball players. Battle Ultimania addresses the characters' abilities, how to develop them via the Sphere Board, combat strategies, and monster/item catalogs.
Serious FF fans might be interested in picking up copies -- the Ultimania series generally includes far more information than is healthy, in packages weighty enough to stun a burglar with (after Neil Gaiman). Check import game shops and Japanese bookstores (such as Kinokuniya) this September.