yeah i wish you could turn the light on so that its would just be a constant when the machine was powered up, also i have to tell you that a friend of a friend might have infected you with a deadly bio weapon before reading your whole post (i swear it wasnt me) and you only have 13 days left to live.....ummmm....sorry?

I don't see how the Wii can suck your bandwidth, it uses a little of it, except perhaps when downloading games or updates.
One thing I noticed, is that if you use DHCP (automatic discovering of your IP address and other network settings), it constantly seek updates at your DHCP server (or perhaps I badly configured it, but I don't think so, my other hosts don't do that).
So I switched back to static configuration.

Yeah, mine is static too...

I don't use WiFi but a wired connection. I noticed last night that even as I turned off the blue light for message notices that the accessory network adapter light was flashing non stop on the wii. As soon as you turn it on it stops flashing...

I did find the solution however, shutting the wii off completely. (holding power for 5 seconds)