Interesting. I suppose I could understand that since they only have passive cooling. I could certainly understand getting a burn off of one of the "bowling balls" since it's a large enclosed chamber with no cooling, but I guess I can't say that I've ever tried resting my hand on the newer aluminum modelsNope, both ~2009 iMacs (the all white ones) and the newer models (part chrome/whatever) have done this to me, but the older ones were far worse. Even idling they were hot enough to sear you.
If you dare, put your hand about 1/4 away from the left edge on the top.

