CustomizeMii is a 100% legal custom Channel creator for the Wii.

Changes:

Switched backend to libWiiSharp ( http://libwiisharp.googlecode.com )
Speed improvements through using RAM instead of temp files on HDD
No separate Mono version anymore, the normal version works with Mono (even compiling forwarders!)
Fixed complex forwarder loading screen to be fullscreen (thanks wilsoff / tantric!)
Fixed bug where startup IOS was set to 0 when sending channel to Wii
Doesn’t require common-key.bin anymore
Added checkerboard for transparent areas in images (preview window)
Added ability to change a TPLs format (preview window)
Added ability to rename and resize TPLs (right click on listbox)

http://wiibrew.org/wiki/CustomizeMii