Se você tiver o Canal da Internet, você pode usar o WiiTransfer . Faz mais do que apenas vídeos também.
O marketing schtick de seu site:
Wii Transfer can share your movies, music, and pictures directly to your Nintendo Wii using the Internet Channel. Copy Miis from your Wii back to your Mac and save them as images. Browse iTunes playlists and iPhoto albums on your television. Convert your movies to formats the Wii understands, either streaming directly from your Mac or for playback in the Wii's Photo Channel. Wii Transfer can even manage saved game backups copied to an SD card.