Check out my friend Habel's soon-to-be-released iPhone/iPod game Litterfin Louie.
From his site:
Eat junk. Clean up the ocean.
The ocean is being trashed by polluters! Help Louie gobble up the trash to keep the water clean. If you miss too much, the water will become toxic. Avoid obstacles and collect power-ups to get special abilities. Coming soon for iPhone and iPod Touch. Mmmmm... junk food!
There is a video of the game on the site. Fun!