WiiMC (Wii Media Centre) is an open source media player for the Nintendo Wii.

Features include

  • Ability to play virtually any video or audio format
  • DVD playback, with DVD menu support
  • Picture viewer
  • Music player
  • Online media support, including SHOUTcast, YouTube, and Navi-X
  • SD, USB 2.0, SMB, HTTP, and FTP support
  • Attractive libwiigui-based interface, designed with the Wii in mind

Changes to v1.3.3
  • Fixed YouTube (thanks jhb50!)

WiiMC 1.3.3 (New Install)
WiiMC 1.3.3 (Update)
or, if you already have WiiMC installed, and an active internet connect, run WiiMC and update when prompted.

The channel installer has been updated, if you need it then here it is.
As far as I know, this is updated to make better usb hdd compatibility. If your setup works then there is no need to update the WiiMC channel.
WiiMC Channel Installer 2.0


Thanks to Tantric and rodries for this great Wii media player.

HacksDen guide to WiiMC - here