Omgmoo

Various Characters:
Set the system date to to following dates to get a secret holiday character listed under the ? at the character select screen
November 22, 2001
Jan 1
Oct 31
Dec 25
Get Homer Car:
Finish all 10 missions in mission mode. Go to Homer's pic in the car select screen to get the car
More time:
hit phone booths that have a pic of Mr. Burns to get 2 seconds
Skip Mission:
Fail a mission 5 times to skip that mission (except for final mission)
Extra Camera Views:
Go to the options menu and Hold L + R and press B, B, B, B. A sound confirms correct code entry.
Get Night:
Go to the options menu and Hold L + R and press A, A, A, A. A sound confirms correct code entry.
Get Soapbox red Car:
Go to the options menu and Hold L + R and press B, B, Y, X. A sound confirms correct code entry.
More Cash:
Go to the options menu and Hold L + R and press Y, Y, Y, Y. A sound confirms correct code entry.
Blimp View:
Go to the options menu and Hold L + R and press X, X, X, Y. A sound confirms correct code entry.
2D Characters:
Go to the options menu and Hold L + R and press X, X, X, X. A sound confirms correct code entry.
Get Slow Motion:
Go to the options menu and Hold L + R and press A, X, B, Y. A sound confirms correct code entry.
Get Nuclear Bus:
Go to the options menu and Hold L + R and press B, B, Y, A. A sound confirms correct code entry.
Get Mr. Smithers in Mr Burns car:
Go to the options menu and Hold L + R and press B, B, Y, Y. A sound confirms correct code entry.
Make Collision Lines Visible:
Go to the options menu and Hold L + R and press B, B, A, A. A sound confirms correct code entry.
Make Time Stop:
Go to the options menu and Hold L + R and press X, B, Y, A. A sound confirms correct code entry.

At the main menu, highlight Options and then enter any of the following cheats:
2D Characters: simultaneously press and hold R and L, and then press X, X, X, X
Christmas Apu: simultaneously press and hold R and L, and then press B, B, X, B
Halloween Bart: simultaneously press and hold R and L, and then press B, B, X, A
More Camera Views: simultaneously press and hold R and L, and then press B, B, B, B
More Money: simultaneously press and hold R and L, and then press Y, Y, Y, Y
New Year's Krusty: simultaneously press and hold R and L, and then press B, B, X, Y
Night Time Mode: simultaneously press and hold R and L, and then press A, A, A, A
Nuclear Bus: simultaneously press and hold R and L, and then press B, B, Y, A
Smithers: simultaneously press and hold R and L, and then press B, B, Y, Y
Soapbox Car: simultaneously press and hold R and L, and then press B, B, Y, X
Thanksgiving Marge: simultaneously press and hold R and L, and then press B, B, X, X
View Collision Lines: simultaneously press and hold R and L, and then press B, B, A, A