Updated 1/20/08:
They DO exist now!
Virus recently converted the codes to work on 1.1:
Codes by Virus:
all u 1.1
Coordinates Modifier
Code:
B21C7374 00000000
94000130 FFBE0000
D9000000 FFFFFAC0
D4000000 FFFFFF30
D6000000 FFFFFAC0
D0000000 00000000
94000130 FF7E0000
D9000000 FFFFFAC0
D4000000 000000D0
D6000000 FFFFFAC0
D0000000 00000000
94000130 FFDE0000
D9000000 FFFFFAB8
D4000000 FFFFFF30
D6000000 FFFFFAB8
D0000000 00000000
94000130 FFEE0000
D9000000 FFFFFAB8
D4000000 000000D0
D6000000 FFFFFAB8
D2000000 00000000
To use, hold A and move around using the dpad (arrows). This can be used to go through rivers and walls.

Save Position Teleport
Code:
94000130 0000007F
B21C7374 00000000
D9000000 FFFFFAB8
D3000000 00000000
D6000000 02000000
D3000000 00000000
B21C7374 00000000
D9000000 FFFFFAC0
D3000000 00000000 
D6000000 02000004
D0000000 00000000
94000130 000000bf
D9000000 02000000
B21C7374 00000000
D6000000 FFFFFAB8
D3000000 00000000
D9000000 02000004
B21C7374 00000000
D6000000 FFFFFAC0 
D2000000 00000000
Special thanks to DsPet who helped me out a ton on the code.
Press L+R+Down to save your position. Press L+R+Up to teleport.


Run Speed Modifier
Code:
921C62A4 00000002
B21C7374 00000000
1000022C 0000xxxx
D2000000 00000000
Replace xxxx with the speed of your choice.

Examples:
0CE2 - super fast
0FE2 - speeding bullet
2000 - warp speed