Everything you need to know about the latest wii loader can be found on wii brew's wiki:
The Twilight Hack works by employing a lengthly character name for the horse in the game ('Epona') in order to facilitate a stack smash. This gets triggered when talking to the man next to you when you start the savegame as he loads the name to use it in his dialog or upon entering the next zone when the game loads the horse for you to ride.
Nice work guys!
All made possible by dumping ram. Kids, don't try this at home