There’s been a little back and forth recently regarding the specifics of the widescreen performance for Okami on the Wii; according to IGN, it ran in neither 16:9 nor 4:3, but somewhere in between with black bars on the sides.
Apparently, that is no longer the case, as Capcom contacted IGN to let them know that the issue has been rectified:
“I know you guys are lovin’ the Okami Wii goodness right now. It’s about to get even better because we’ve got a fresh build coming your way next week. You might have noticed the aspect ratio was a little off. We did too, and the build you’re receiving will display in full 16:9 (no black bars on the sides). Now you’ll get to experience the game the way it was intended to be seen. Your screenshots should look better too.”