I just bought my wii about 3 weeks ago. I was upset when i found out that it was not possible to save music and videos on a sd card and play on the wii. I can't do any of that and that really upset I know that the wii is not an entertainment system like the xbox or ps3; but i like to have everything all in one. i did not want my wii to be modded, so i was searching for something that would not open up my system voiding my warranty. I found software called wii media that will help you get to see your vids and listen to your music. Check it out here is the link.
Wii Media Downloads - Officially the world's first Wii download service
I am happy with software and pleased that i do not have to go to my pc as my entertainment tool.