The Simpsons Game Cheats for the PS2

Unlimited power for all characters:

Enter this code while in the "Extras" menu: Circle, Left, Right, , , L1

Unlock all Clichés:

Enter the code while in the "Extras" menu screen: Left, , right, , right, L1

Unlock all Movies:

Enter the code while in the "Extras" menu: Square, Left, , Right, , R1

All outfits and trophies for Marge:

While in the extras menu type in triangle, , , , , R3

Unlock Lisa's Outfits & Trophies:

To unlock all Lisa-related outfits and trophies, insert the following code while browsing the main menu: Square, , , , , L3 (click left analog stick).

Thanks to Revolution Readers Logan Teague and bladders!