DRIV3R (PS2)

All Weapons
At the main menu press R1, L2, SQUARE, CIRCLE, R1, R2, L2.

Unlock all Vehicles
At the main menu press L1, L1, SQUARE, CIRCLE, L1, R1, CIRCLE

Invincibility (not in story mode):
At the main menu press SQUARE, SQUARE, L1, R1, L2, R2, R2.

Unlock all Missions
At the main menu press L1, R1, L1, L2, SQUARE, SQUARE, CIRCLE.

Immunity
At the main menu, press CIRCLE, CIRCLE, L1, L2, R1, R2, SQUARE and you will hear a noise. Then go to options, then to cheats, then turn on Immunity. This makes cops unable to see you. A-ha!