Assuming you went the usual bannerbomb-bootmi-(hackmii installer)-Homebrew Channel route first, you would already have DVDx firmware now installed in your wii, because it is by default added as part of the installation of the bootmii-HBC install. Unless you turned it off, of course. Therefore you can use wiibrew media players that use DVDx and play movie DVDs too. Get hold of Mplayer CE. It is the "christmas edition" of mplayer for the wii. Oddly, the CE version is more stable than the latest version. It is an awesome bit of software, it will allow you to play movie dvds, and allow you to stream mp4, avi, etc from your PC to your wii. Awesome software.
Muppet. I've actually answered my own question
Download MPlayer CE.
In Dogegg's sticky, there are several downloads with no REAL explanation as to which one to use...
The first file is the dvdx files you need on your wii to ba able to use normal dvds. It is kinda like firmware. I mentioned in my earlier post that dvdx is installed during your bootmii hbc install, so you wont need that file a secind time (you should already have it on your wii).
If you want MplayerCE the second file in the list is the one for you. You should now have a folder on your SD card called "apps". Put your Mplayer CE folder in the apps folder. Provided there is a file in the mplayer folder called "boot.dol" then your Homebrew Channel will find it ok, and you will be able to launch the program fine. This is the general method most people use for launching applications.
If you want mplayer CE to be launch-able from your main wii menu screen, use a wad installer program (as mentioned earlier) obtain the third file in the list, the "wad" file. Wad files are the program, plus a few other bits. Wad manager installs these. Applications that you particularly want to clutter up your wii menu screen are sometimes obtainable in wad format, as this one is.
The fourth file is probably a mini-install that downloads the majority of the application via an internet connection.
The fifth file isnt the CE version of mplayer at all - it is obviously dogeggs preferred media player, a version of mplayer that has been modified by agentx. Having not tried this media player, I cant comment on whether I think it is better/more stable than the CE version!
Hope this helps :-)
Just a quick one - haven't had chance to play the Wii properly since installing everything, although the kids have.
Do the game saves still work?
AT work so can't test it!!