have a look here... http://www.xpgamesaves.com/topic/61958-how-to-mod-minecraft-xbox-360-edition-using-360-revolution-tutorial-with-images/
He's probably talking about PC mods. Though there is one big problem. The 360 version is coded in C++, while the PC version is written in Java. Therefore PC mods would not work, unless someone converts them from Java to C++.