For future reference, mine is done in a heat wave sitting in 2nd floor of my house which is at least 5 degrees hotter than my first floor. My Wii was laid horizontally and after some test, I realized it's bottom was pretty hot (or at least warm) even with wiiconnect24 off... Also, I am not suggesting that WiiConnect24 is the actual cost, just that seems likely and better turn it off just as a precaution.
I am a PC gamer, and also have a NDS now, but without access to a Nintendo Wii until End of 2007.
Currently playing: Super Smash Brothers Brawl(Wii), Mystery Dungeon: Shiren the Wanderer(DS), Dragon Quest Heroes: Rocket Slime (DS), WiiFit(Wii)
Games Recently Beaten: Final Fantasy Crystal Chronicles: My Life as a King (Normal; Very Hard after the next DLCs become available)
1 word: RTFA







