Code:                   Result: 
GASMASK                 Unlimited Health 
1WITHFORCE              Campaign Level Select 
CHOSEN1                 Unlimited Ammo
FRAGFIESTA              Unlock Multiplayer Levels
CORDE                   Unlock Padme 
ROGERROGER              Use Battle Droid in Geonosis Academy 
WAT TAMBOR              Use Super Battle Droid in Academy 
FUZZBALL                Use Wookie in Jedi Academy 
CINEMA                  All FMVs 
YUB YUB                 Unlock Bonus Objectives 
SAYCHEESE               Development Team Photos

Hear the Ewok song:
     At  the  options  screen,  press Up, Up, Down, Down, Left, Right,
Left, Right, B, A, Start

Unlock list:
     Get the indicated amount of bonus points to unlock more items.

5 bonus points          Raxus Duel MP Map 
10 bonus points         Thule Moon Control MP Map 
15 bonus points         Rhen Var MP Map 
20 bonus points         Jedi Academy MP Map 
25 bonus points         Unit Viewer 
30 bonus points         Making Of FMV 
35 bonus points         CD Player 
40 bonus points         Sketchbook 
45 bonus points         Yoda for Multiplayer