Homebrew allows programmers at home to be able to develop software for the wii and release it to the public without having to develop it using conventional methods that nintendo requires to creat software. It allows for such programs as media players, custom games and many other possibilities. Research gamecube homebrew and xbox homebrew to see what things are possible. Also with the wii remote, wireless access, sd and usb we can only imagine what we may be able to do in the future. (Assuming we are even allowed to talk bout this anymore as some people here seem to believe that modding your wii is horrible and everyone who does it deserves their product to be destroyed)