Ok - So, I've been waiting around for someone else to build a working mythtv front end for the wii, using home brew.
To say the least, I have up waiting and did it myself ;)
I took a basic Linux stack for the wii, found OOC deb packages and manually installed them into my SD card, tracked down and install all the required libs and well - to say the least - WIIIIIIII I have a mythtv front end, almost.
Unfortunatly, all the USB ethernet addaptors I have don't seem to work on the wii with linux - so I'll need to go pick up one of those to confirm that this is working. Once I get to confirm it's working, I'll preatty and clean it up build some tgz's of it and provide some details on how to install it.