Candy Suxxx From Vice City:
Take your memory card that has Vice City saved on it 
and load it on to San Andreas.

All Weapons:
While playing the game, 
press: R1, R2, L1, R2, Left, Down, Right, Up, Left, Down, Right, Up. 
If typed in correctly then a confirm message will appear.

More money:(san andreas)
R1,R2,L1,x,left,down, right,up,left,down,right, up.
 - Mark Bartock

heath,armor,and $250,000
R1, R1, R2, X, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, UP.
 - Anthony Martin