Well, it depends what you did to brick your wii. More info would be helpful, such as exactly what it does right now beyond bootmii/cboot2, what other software is installed (preloader, startpatch, etc.) and the version of the system menu.
As for the basic bricks:
* If you installed a channel and it banner bricked, just uninstall the channel.
* If you accidentally uninstalled the menu IOS, just reinstall it.