The Homebrew Channel
The Homebrew Channel is a channel for launching Wii homebrew applications. It will list homebrew applications stored and organised on an SD card or USB mass storage device in a nice little GUI, which you can very easily customise with descriptions and shiny little icons all by yourself. You can also launch applications via TCP (with a correctly configured PC) or a USBGecko. Both of those built in options make it extremely convenient for testing out new code, as well as a general purpose homebrew launcher.