Here's what i did:

 1.Purchased a generic component cable for WII.

2.  Plug the Red/Green/Blue cables to back of AVR Component in video section

3.  Plug the RCA (Red/White) cable to an audio in input on the AVR

4.  Run a seperate Componet Video Cable from AVR component output  to TV component input.

 I've notice a much better picture using component cable with WII vs the standard 1 plug video cable.

It does suck that there is no HDMI or digital audio out on WII but you will find the component plus RCA's make a nice improvement.