Ubuntu without password requests

When I bought a computer for my son a few years ago, it came with XP preloaded. It was a refurbished computer from a local store, and they do a good job of putting together a cheap, basic system. At the time, I contemplated wiping the disk and putting Linux on it instead, but since it was already working and ready to use I decided to leave it as-is. The guys at the store had put Firefox and OpenOffice on it, so why mess with it?

Transcoding MP3 files for Nintendo DSi

My son's Nintendo DSi is a very cool little toy, but could they have made it harder to put music on it? After copying his MP3 files over to an SD card and putting it in, I thought I was done. But clearly Nintendo has other ideas.