HOW TO: Encode DivX movies to play on your Wii
Through the photo channel the Wii can play movies in MJPEG format, but it can’t read DivX, XviD or 
MPG movies. Now there is a simple solution for converting videos to play on your Wii. Wii Video 9 is just like PSP Video 9, where you select movies and click on covert to get the job done. I played with the tool yesterday and it can convert MOV and DivX movies with ease. Below is a demo of some of the converted movies, which look fairly decent. Siliconera » How to encode DivX movies to play on your Wii