yep. here you go.
option #1 http://code.google.com/p/vlc-shares/
option #2 http://www.playon.tv/playon
after either one of these (i use both). you'll be able to turn the wii into, a sorta boxee type device.( can't remeber the other things name.). but also remember the wii has a slower prosseser so it will buffer alot. or the picture will be pixeled. but viewable.