The Menu Loader is a simple .dol executable capable of rebooting the Wii under custom boot settings.

These options include:

Debugging Mode (via USBGecko)
RegionFree Mode for Wii Channels
RegionFree Mode for Wii and Gamecube discs
No Music in the Wii Menu
IOS selection to choose any version of the Wii system menu.
No Health/Safety Screen