Bruce Schneier is one the smartest thinkers about security, so his observations are purposefully scary, but check out that quote – “There seems to be no way to disconnect the Internet”

According to the specs of the new Nintendo Wii (its new game machine), “Wii can communicate with the Internet even when the power is turned off.” Nintendo accentuates the positive: “This WiiConnect24 service delivers a new surprise or game update, even if users do not play with Wii,” while ignoring the possibility that Nintendo can deactivate a game if it chooses to do so, or that someone else can deliver a different — not so wanted — surprise…We all know that, but what’s interesting here is that Nintendo is changing the meaning of the word “off.” We are all conditioned to believe that “off” means off, and therefore safe. But in Nintendo’s case, “off” really means something like “on standby.” If users expect the Nintendo Wii to be truly off, they need to pull the power plug — assuming there isn’t a battery foiling that tactic. There seems to be no way to disconnect the Internet, as the Nintendo Wii is wireless only.

http://www.schneier.com/crypto-gram-0605.html#5