I did "impulse 101", and to my surprise, I found I could kill him! The funniest part is that the scene was so scripted, that it went as usually, with nobody noticing! LOL! Here's a pic:
This is important because it poves that the Doom 3 engine can produce high-res textures, and that the only reason that id hasn't got any is because of performance hits. (The guy at doom3world.org said that he drops to 30 fps)
According to Computer Gaming World magazine, it's called the "Grabber", and can "allow you to hold and launch just about any imaginable object in the game."
My first thought was "What a rip-off!." But this might not be such a bad thing. I'm all for having a gravity gun in every game! :)