I’m not 100% sure, but I do think that the overheating problem is being caused by the iPhone OS 3.0 software update and it isn’t affecting the iPhone 3GS only, it’s affecting other iPhone and iPod Touch devices as well. After updating my iPod Touch to 3.0 I did notice that it got warmer whenever I plugged it in to charge it or played a game. I just did a quick search on Twitter, and it looks like I’m not the only one who has experienced this. I expect Apple to fix this in their next iPhone 3.0.1 or iPhone 3.1 update (which will hopefully be soon!). How has your iPhone OS 3.0 upgrade experience been so far? Do you have overheating problems because of iPhone OS 3.0?