I think everyone should have this link.
Works on Any wii 4.2 or below.
By the end of this you will have hacked firmware, installed a softmod, and you can now boot backups/homebrew off USB stick, Hard drive, DVD, or from SD with Neogamma, configurable usbloader, and others.
http://gbatemp.net/index.php?showtopic=171901
Id write a Tut, but seriously, its already done at the link above!