There was a thread about this here earlier but it was rather vague and is long dead. I'm trying to make a concise and complete list of Xbox 360 games (either disc based or from XBLA) that have built in Japanese Support. If you know any that I missed please comment below. I'm looking especially for games with a lot of Japanese content and little English. Some games can be changed via menu but usually the Japanese support is accessed by changing your console's language to Japanese under Initial Setup under Settings.

Banjo Kazooie and Banjo Tooie
Text, menus, story, and logos in Japanese

Braid
Menus are in Japanese as are the pre-chapter stories

Castle Crashers
Menus and text in Japanese

Cave Games ie. Guwange, Nin2-Jump etc.
Menus and text in Japanese

Game Room
Game histories, descriptions, and trivia in Japanese

Half Minute Hero
Menus, text and story in Japanese

ilomilo
Menu and story in Japanese

Lara Croft: GoL
Voice acting, text, and menus in Japanese

Lost Odyssey
Text, voice acting, menus all in Japanese. Short stories appear through out the game and the voice acting is subtitled in Japanese.

Marvel Vs. Capcom 3
Voices menus and win quotes in Japanese

Perfect Dark
Menus and text in Japanese

Pinball FX
Table descriptions in Japanese

Pop Cap Games ie. Bejeweled, Feeding Frenzy, Heavy Weapon, Peggle, Plants vs. Zombies, Zuma
Menus, instructions, and story in Japanese

Puzzle Quest
Menus, text, and quests in Japanese

R-Type Dimensions
Menus in Japanese

Resonance of Fate
Text, voices, story, and menus in Japanese

SNK Fighters ie. King of Fighters 98, 02, Garou MOW, NGBC
Voices menus and win quotes in Japanese

Street Fighter 3SO
Text, menus, voices, and achievements in Japanese

Street Fighter 4 Series
Voices menus and win quotes in Japanese

Super Meat Boy
Menus in Japanese


*****************************************************
*Games with Japanese Voice Tracks but no Japanese Support
*****************************************************
Blue Dragon
Enchanted Arms
Record of Agarest War
Record of Agarest War Zero