Wii Media Center X v0.92

Wii Media Center X is a media server solution that can stream video, audio and picture content to Nintendo Wii over Wi-Fi.

It uses the Wii browser to stream your videos as Flash video, and your music as MP3 files. It hasn't been in development for a while but it should still work for most multimedia files. Don't expect miracles however, the Wii was not meant to be a media center.