Recording High quality video footage with TV devices has always been successful. You might be able to find a guide to that on this website.
If you want to rip files form Wii discs, you might want to have a specific optical drive (i forgot about it

, search the net or
www.ps3news.com). Wii uses same old Gamecube file formats most of the time for media encoding, so you'll be in luck. Get some codecs or utilities for Gamecube media ripping and you'll do fine.