MLB 08 - The Show - Platform: Playstation 2

All classic stadiums:
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At the main menu, press Down, Right, Circle, Square, Left, Triangle, Up, L1 to 
unlock all classic stadiums. If you entered the code correctly, the controller 
will vibrate. It will not show up on your profile, but it does work in 
Exhibition mode.

All Golden and Silver era players:
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At the main menu, press L1, L2, Square(2), Triangle, Circle, Down to unlock all 
Golden and Silver era players. If you entered the code correctly, the controller 
will vibrate. It will not show up on your profile, but it does work in 
Exhibition mode.