Mii Extractor
If you're a bit attached to your own Mii, this Nintendo Wii homebrew application from (yet again) coder waninkoko is particularly for you. Mii Extractor version 1.0 lets you extract all the Mii avatars from your Wii to an SD card.
This is another simple-to-use homebrew in the likeness of dev waninkoko's Wii Duplicated Channel Remover version 2
Mii Installer
Give your Mii a vacation house... on your SD card? Nah. This is the Mii Extractor and Mii Installer homebrew programs from developer Waninkoko.
These programs allow you to transfer all of your Miis back and forth from your Wii and SD card. Just run the respective program to either install or extract your Miis
DSBlue A coder by name of ThaKilla has just released a new homebrew DS app of his called DSBlue. It's a work in progress and, as such, DSBlue will no doubt undergo quite a few changes before its final release
Mii Extractor
Give your Mii a vacation house... on your SD card? Nah. This is the Mii Extractor and Mii Installer homebrew programs from developer Waninkoko.
These programs allow you to transfer all of your Miis back and forth from your Wii and SD card. Just run the respective program to either install or extract your Miis