there Is a thing called iExplorer and it's a non jailbreak way it install the mods but the rest I don't know
Yup. I've done so on mine.
No, you cannot install mods on the 360. You need the ps3 or PC versions to install and use UT3 mods.
Google for Modstallation. You can use that software to install mods.
Check out the link below for a guide of how to install mods in Minecraft.
It might not be out yet but it should be. You have to download and install forge then you can install mods by going to .minecraft/mods and adding a mod there.
The Server has to install the mods Not You.
You can't
loongkee
Easy
no
Just to let you know you can only get mods on the PC version