eh, I recognize heat is bad for components but I don't believe people should get all paranoid about it... Here is my stack of equipment from top to bottom, all setting directly on each other... have been this way for about 2 years, never had a problem. Dvd Player, Series 2 TIVO, Dish 510, Dish 625, Sony Surround Sound Receiver...
notice, 3 dvrs, all stacked on top of each other, all constantly running... never have had a problem