Wasn´t there actually a story about a boy whose iPod BURNT thru his pants? I found it on escapist last year. But on a regular basis, yes they are safe. I also Undervolt my MacBook and set the fan a little higher, runs cool with not getting warmer than 71deg Celcius under heavy load. anyway if I´d pick a case it´s metal back snap thing.
ZOMG So I put in my oder for my 4th Gen iPod touch today. Should be getting it real soon. ZOMG!!! IM EXCITERATED!