Code:                   Result 
UNDERTHEMASK            lets you play in FP view
GOESTOYOURHEAD          gives spider a big head and big shoes
SPIDERBITE              turns you into a real small spider man,
                        everything else is huge
                        (alternatively try SPIDERBYTE)
JOELSPEANUTS            all villains have big heads
DODGETHIS               lets you fight in like a matrix style when fighting
IMIARMAS                unlocks all levels
ROMITAS                 bottom option in menu during game;
                        skip to the next level
KOALA                   unlocks all the moves for spider man 
ORGANICWEBBING          unlimited web
REALHERO                lets you play as a street cop
FREAKOUT                lets you play something resembling a Cyborg
CAPTAINSTACEY           lets you play as a motor cycle cop
THUGSRUS                lets you play as the thug in the mask
STICKYRICE              lets you play as the guy who killed his father
KNUCKLES                lets you play as the black thug in the red jacket
SERUM                   lets you play as a scientist
HERMANSCHULTZ           lets you play as the shocker
GIRLNEXTDOOR            lets you play as that girl reporter
HEADEXPLODY             Pinhead bowling mini-game

Hints:
     Play  as  Alex  Ross  Spider-Man:  Beat the game once on at least
Normal difficulty
     Play as Peter Parker: Beat the game once on at least Easy difficulty
     Play  as Wrestler Spider-Man: Beat the game once on at least Easy
difficulty

Unlock Pinhead Bowling: Earn 10,000 points in Story Mode
Unlock Special Vulture Movie: Earn 20,000 points in Story Mode
Unlock Shocker Test Animation: Earn 30,000 points in Story Mode
Unlock Unlimited Webbing: Earn 50,000 points in Story Mode