There's a Naruto/Once peice/DBZ crossover game for the PS2 and Xbox...but I can't remember what it was called....
Type one of the anime titles in to Gamespot or something.
I saw that game advert ages ago on GS, it looks really neat...but since I'm not a Naruto fan I won't be buying it.
The graphics truely do look wonderful...it's just a pity they won't release a Dragonball game like that.
I'd love to play through Goku's childhood in a sandbox-style game.