Talk to Mr. Matale, in the end, when he offers you a bribe, demand 2000 credits, and you'll get dark side points. Once he goes back into his estate talk to the droid to get him to come back out, simply repeat the process until you receive an infinite amount of those beloved Dark Points

(You need two controllers for this trick) Before the the final battle with Darth Malak press the L & R Triggers plus the Y Button on all controllers that you have plugged into the Xbox. It's recommended to have the primary controller in port 1 and another controller in port 4. This must be done before you enter the door to face Darth Malak. You'll know if you did it right if your Jedi takes out her/his lightsaber. Then open the door and walk up to Malak and talk to him.