looks around...most seem out there...
i've actually been playing Gladius on xbox recently.
its a kind of turn based build your own roman/viking gladiator school tactical RPG made by Lucas Arts with two differing story arcs based around two different lead characters (both headed for the same destination it turns out).
it had a PS2 release too which personally i've never managed to get to work over 3 copys and 3 different machines (it apparently has abysmal loading times
IF it works anyway) and there was Gamecube version too i think...but xbox version is ok...
game has a nice enough art style, cut scenes are well done, it has a pretty cool grove that's uniquely its own. storyline is a bit of a hodge-podge of stuff but *shrug*.
its quite a relaxing cool game i think.
it also has an initially hidden local (ie not online) multi player mode...although i have not had the opportunity to really try that out yet.
eh what else...
Jurassic Park: Operation Genesis is pretty cool (its a build your own Jurassic Park sim/management game)...if a little brief...
oh and the xbox version of Dynasty Warriors 5 (often mentioned as the best Dynasty Warriors that generation and even possibly the best Dynasty Warriors iteration ever) let's you use the Japanese voice acting in non Japanese versions of the game...which is a feature exclusive to the xbox version of the game afaik