Because the Wii Opera browser supports flash, we can use this as the medium to stream MP3 and Video files to the Wii.
Running your own HTTP server (apache or IIS), install a Flash Object into a HTML page, and use this flash object to play a video or a MP3 file.
I don't know much about flash objects (as you may be able to tell). But this could be a way to do it. A "flash media player" of sorts with file browser would be good.
Does anybody know of something like this??