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Playstation 2 - Hitman Blood Money cheats

Unlock all weapons:
Press Triangle, Triangle, Square, O, R1, O, R2, X, X on the start screen 

Change the main menu:
Finish the game to change the background

Unlock extra mission and alternate ending:
At the end of the game (Requiem sequence), keep tapping up on the 
left analog stick while the credits are rolling to revive him 
and play a secret level. Complete this level and you can see 
the alternate ending. 

Unlimited saves:
During of a mission and you're in the process of saving, repeatedly 
press the start button. The number of saves won't change.