On the Ebon Hawk after you spar with Handmaiden she won't be wearing any clothes. Dress yourself, then tell her to put some on. You can sell these robes and repeat the process indefinitely.
Tons of components:
Using the money cheat above, buy a bunch of cheap, unlimited items (i.e. $26 energy shields from the left vendor in Telos), take them to your workbench, and disassemble them into components. Repeat until you're drowning in components, then upgrade your stuff!.
After beating Mira or Hanharr, exit the pit through the door then go through another door on the left. After you go through this door and defeat the enemies within, walk into the wall directly opposite the door you just came through and press A when your reticule turns blue.
Find the broken speeder in the refugee camp on Narshadaa and install a navigation interface (you can buy one from a droid vendor). Don't repair anything else or install any other parts. You should get 400 exp and the navigation interface back. Rinse, wash, repeat.
Endless light side points:
Everytime you talk to the last handmaid in the Jedi base on Telos you'll gain light side points, so long as you don't say anything rude.
Endless dark side points:
Help the Ithorians on Telos, When you rescue them from mercenaries, talk to Moza in Vivarium, and tell him he has to fend for himself. Repeat, get more evil, repeat.
After fighting Viasis, after she boards the Ebon Hawk, talk to Kreia about 'What Viasis did to your eyesight'. As long as you don't say anything jerk-ish, you'll gain influence over her. You can repeat this as much as desired.
Against droids, containers, and locked or busted doors the plasma torch is indispensable.
Special thanks to Revolution readers nathan weis, Eric Z-man, Danny, BCGrobal and Kryuhkin!