My cousin just bought a house 3 weeks ago and last night had an open house. Since he lives on the other side of town where there's lots of new neighborhoods that I'm unfamiliar with, I thought it would be a great opportunity to use the maps on my new iPhone 3GS. For the entire 30 minute ride, the phone sat in a cradle in my car charging while alternately jumping between the maps and my pandora app. When I finally got to my cousins house, I was amazed at how hot the back of the phone was. Is anyone else finding their phone running really warm/hot? I even have a rubber skin and the heat was coming right through it.