Unlock Skaters:
At the 'Cheat Code' screen in the 'Options'menu enter the following passwords

Mat Hoffman:
The_condor

Mindy:
Help1nghand

Jason Ellis:
Sirius-DJ


Unlockable Movies and Skaters:

Lil' John, Iggy, Jason Ellis:
On 'Normal' difficulty setting beat Story mode

Jimbo, Murphy, Mega:
On 'Sick' difficulty setting beat Story mode

American Wasteland:
On any difficulty setting beat Story mode

Robo-Tony, Mindy:
On 'Easy' difficulty setting beat Story mode

Matt Hoffman, Useless Dave:
On 'Sick' difficulty setting beat Classic mode

Billie Joe, Boone:
On 'Normal' difficulty setting beat Classic mode

Neversoft Skates:
Comlete 100% of Classic mode

Pro Bails 1:
On any difficulty setting beat Classic mode

Pro Bails 2:
Complete 100% of Story mode

PED Groub B (Dogtown Guy, Barber, Carnival Worker, French Man):
Get all 43 Skate Ranch Pieces and complete Skate Ranch Missions

PED Group A (Cholo, Baller, Welder, Camera Guy):
Complete 100% of Story mode

PED Group C (Dogtown Guy 2, Master Zen, Hard Hat Worker, Graffiti Dude):
Complete 100% of Classic mode

PED Group D (Boone in Briefs, Oil Rig Worker, Police Man, Performer):
Complete 100% of all Gaps


Unlockables:

Full Stats:
Complete all Sponsor Challenges

Always Special:
Collect all Gaps in all levels

Moon Gravity:
Collect all Gaps in all levels

Perfect Manual:
Collect all gaps in every level

Perfect Rail:
Collect all gaps in every level

Perfect Skitch:
Collect all gaps in every level