Newbie to all this, so I have a question. Can you use the GECK to create mods for PS3 and XBOX360 without having the PC game installed?
It's literally impossible to do that.
Also, people on this messageboard go nuts if you start talking about modding the PS3/XBOX version of the game, using the word "illegal" to describe it. The thread gets locked by the moderators right away. I suspect it's against your terms of service with the PS3/XBOX makers to mod the game, and that's where it gets spiraled into the "illegal" idea. Not that Microsoft can make laws, but anyway, you cannot talk about that here.