+1 million studs:
At the main menu, press Start, Right, Up, Left, Down, Select, L, R.
+3 million studs:
At the main menu, press Start, Start, Down, Down, Left, Left, Up, Up, Select.
Debug and Debug Multiplayer options:
At the main menu, press Up, Left, Down, Right, Up, Left, Down, Right, Up, Left, Down, Right, R, L, Start, Select.
Bonus Touch Game 1:
At the main menu, press Up, Up, Down, L, L, R, R.
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Lego Star Wars: The Complete Saga Cheats, Codes & Walkthrough/Guide/FAQ for Nintendo DS from Cheat Code Central
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Lego Star Wars: The Complete Saga Cheats at CheatingDome.com.