HOW TO KILL HIM THE EASY WAY
Ok the easy way to kill the rancor is to look in your inventury for your synthesized ordor I sure you will have.Then go to the pile of skelitens on the otherside and click on them and put a synthesized ordor and a poison gernade in the pile a cut seen will appear and he will be dead.That is the best way I think to kill him.You don't have to used a bunch of your gernades tring to kill him just one synthesized ordor and one poison gernade and that will do it.

Actually, I nailed him with one standard frag gernade. I think any ordinance other than blasters/lightsabers/swords he swallows will do him in. But I could be mistaken. Nothing says "HI!" like a lightsaber igniting in your gut. :D

I used the stealth/grenade method.

Very quick, easy way to do it. :)

Did anyone get dark or light side points for any of those methods?

No at least I did not get any light/dark side points.

Yeah, now that I think about it, killing a rancor is killing a rancor. He's a bad guy and there's not really a "wrong" or "bad" way to kill him.

Here's how I made the rancor meet his maker. Using stealth I snuck up behind him and laid a mine, went a few feet back toward the entrance and laid another mine..etc, etc. until I had about four or five mines. Once my deadly path had been laid down, I taunted him with a single rifle blast. This seemed to get his attention and he came running after me....BLAM, BLAM, BLAM, BLAM....THUD...he dead!!!

i used alot of frag grenades but it worked lol:D