3-D Mode *new* - Head to extras selection screen, input the code and it will shift the colours of the game making it all 3-D.

Code Effect - Strangeloops Turns The Game 3-D

Passwords - Unlock Big Black

Enter - letsdowork in the code entry screen under extras.

Password Effect - letsdowork Unlocks Big Black as a playable character

Unlockables

Complete each achievement to get the allotted gamerscore.

Active Skater (20) Successfully complete all online freeskate activities with your created skater
Amateur Skater (15) Achieve Amateur Rank Online
Anyone Else? (20) Beat all the pros at Throwdown challenges
Big Air Champ (50) Win the San Van-a-Slamma
Cooperation is key (10) Complete 50 online freeskate activities with your created skater
Dethrowned (20) Download and own a community-created spot
DIY (35) Spend 30 minutes moving objects in career mode
Fully Sponsored (50) Obtain all sponsorships
Gender Bender (5) Change your skater's gender
Good Samaritan (20) Knock down a security guard chasing another skater in career mode
Graphically Extreme (5) Add a custom graphic to your skater
Grasshopper (20) Perform one grass gap of at least 10 meters or 30 feet in career mode
GVR Champ (20) Win the GVR Contest
How you like them apples? (20) Acquire all phone numbers for the pros
I Like To Move It (5) Move your first object in career mode
Juggling Chainsaws (20) Wipeout at high speed in career mode
Make it Big! (15) Use Big Black's service 10 times in Career Mode
Meet Slappy (5) Meet Slappy
Need for Speed (50) Maintain maximum speed for 5 seconds in career mode
New San Van Hero (20) Call Mikey 10 times
On Top Of The World (20) Perform an invert on one of the highest points in the city in career mode
Online Legend (50) Achieve Legend Rank Online
Online Pro (25) Achieve Pro Rank Online
Perfectionist (50) Complete all paths in career mode
Playing Nice Together (5) Complete your first online freeskate activity with your created skater
Pull the Plug (15) Drain every pool and fountain in career mode
Pwn some n00bs (15) Win an online ranked match
Race Hero (20) Win all races in career mode
Real Estate Mogul (50) Purchase all property in career mode
Running Man (5) Escape a chase off board in career mode
Sandbag (20) Break at least 15 bones in a single wipeout in career mode
SBM Cover (30) Get the cover of The Skateboard Mag
Skater Evolved (5) Get off your board in career mode
Skater's Choice (20) Win the Skater's choice award in an online ranked match
Skitched Up (5) Skitch for 1000 meters or 3000 feet in career mode
Spare Parts (50) All Hall Of Meat paths complete
Stairmaster (20) Perform one stair gap of at least 12 meters or 36 feet in career mode
Still Alive? (5) Win a Deathrace in career mode
Taste The Mongo (20) Mongo Push 5000 times in career mode
That's the Way (20) Beat all of Danny Way's film challenges
The Architect (5) Upload a created spot
The Critic (10) Rate 10 community videos and photos
Thrasher Cover (30) Get the cover of Thrasher
Uninsurable (20) Break 100 bones in career mode
Urban Legend Too (40) Own all spots in career mode
Where's my TV show? (20) Beat all Rob Dyrdek challenges

Dem Bonez - To unlock Dem Bonez, complete all Hall of Meat objectives in Career Mode.

Unlockable Crowns

King of the Mountain Crown Beat all of the Races in Career Mode (not the bonus races though)
Legend Crown Reach Legend level online.

Certain in-game milestones unlock places for you to skate.

GvR Plaza Complete all Street Challenges to unlock the Etnies GvR Plaza.
Monster Skate Park Get Sponsored and complete Team Film Challenges until you get a demo sesh with Rob Drydek, After completing this earn $200,000 to buy the park.
S.V. Dam Complete all the Thrasher Mag challenges to drain the dam.
S.V. Stadium Complete all Tranny Contests to unlock the S.V. Mega-Ramp Stadium.
S.V. Summit Complete all the Death Races to unlock the peak of Cougar Mountain.
Training Park Complete all Team Film Challenges to unlock the Training Park.