Metroid Prime 3: Corruption Cheats

When in Samus' ship, go to the radio and press the following symbols:
Going from left to right, press the fourth symbol, the sixth symbol, the first symbol and then the seventh symbol.

You will then hear a message from Mr. Sakamoto, co-creator of the Metroid Series!

When in Samus' ship, go to the radio and press the following symbols:
Going from left to right, press the eighth symbol, the third symbol, the fifth symbol and then the fourth symbol.
You will then hear a message from Mr. Miyamoto!

A rough translation:
Ah, can you hear me? This is Miyamoto.
All of you playing Metroid, can you hear me?
It’s fun, isn’t it?
I’ve also worked on many [Metroid] games, but this one is the best yet, don’t you think?
Definitely play it all the way to the end.
See you!

When in Samus' ship, go to the radio and press the following symbols:
Going from left to right, press the first symbol, the third symbol, the eighth symbol and then the fifth symbol.

You will then hear a message from Mr. Tanabe!

When in Samus' ship, go to the radio and press the following symbols:
Going from left to right, press the third symbol, the sixth symbol, the fourth symbol and then the eighth symbol.
You will then hear a message from Mr. Yamamoto!

When in Samus' ship, go to the radio And press the following symbols.
Going from left to right, press the second symbol, the seventh symbol, the fifth symbol and then the first symbol.
You'll be greeted by Iwata himself. Of course, this is in Japanese.

A brief translation...
Hello, this is Iwata from Nintendo.
A president has to take things really seriously, even if it doesn't seem like it. It's understandable if you lose weight from stress...but I get fatter instead. Nobody thinks I'm taking it seriously.

Having these games on your Wii system memory will cause your ship to get decals when you enable the bumper sticker bonus:
Wii Play
Wii Sports
Zelda: Twilight Princess
Super Paper Mario
Metroid Prime 3
Excite Truck
Wario Ware: Smooth Moves
Mario Party 8
Super Mario Galaxy
Super Smash Bros: Brawl