WiiMU is a PoC “Channel Launcher” app for the Wii. It eventually aims to completely replace the System Menu in functionality. At the moment it is quite far from that goal, but it does have a start.

Important Information:

There are some slight problems with 0.1a3. First, on the channel list, you may get two listings of a channel. Choose the first one. Second, the elf file is named WiiMU.elf. You must rename it to boot.elf for it to work. These issues have already been brought to attention and will be fixed in a4

http://www.wiibrew.org/wiki/Homebrew_apps/WiiMU