Wiiconnect is basically the Wii equivalent to a PC's always on connection. Just with the option to turn it off internally instead of unplugging a router. I've never turned mine off except when I first modded. About the same time as WiiJohn. Maybe a little longer.
I wish Nintendo would update our consoles without consent, I'd have a field day with 'em. It says nothing about that in WiiConnect 24.
"WiiConnect24 allows the console to receive downloads even when the console isn't in active use, as long as it has a working connection to the internet. The types of information that can be received include News and Weather, messages posted to the Wii Message Board, and any messages sent by Nintendo about new Wii console features." - Nintendo.com
Key word "Messages" even your PC can download but not install updates until u say so.
13 Wii's, 6 PS2s, 17 PSP 2000's, 7 PSP 1000's, 1 XBOX360's, & 3 iPhone's hacked and counting...
Yeah buddy, rollin' like a big shot.