Wii SCU has a simple interface but doesn't tell you what non-channel-specific updates need to be installed for specific channels to work.Wii Homebrew is an independently made channel for the Wii that includes access to Homebrew games and applications made by non-corporate developers.
The two I have tried are Wii SCU and Pimp My Wii *, either of which can be used to update channels.
In order to make an application appear in the Homebrew Channel, the following steps must be taken: Now the application will appear in the Homebrew Channel.
Question: How Do I Update Wii Channels if I Have Homebrew Installed?
Once installed, users can access the channel from the Wii System Menu just like any other Wii channel.
It can launch or install homebrew applications from an SD or SDHC card or via TCP/USB Gecko using Wiiload.