I've got a MacBook and the power-brick gets stupidly hot when charging.
I had it on a worktop the other day and it got so hot it turned the varnish tacky and stuck to it!
How hot should it get? and how can I measure the surface temp?
Well I'm not bothered about the work-top, but I did fall asleep a few weeks back, roll over onto the power-brick and wake up with a slow cooked patch on my back!...Just try to keep it off any damageable surfaces!